Calculators
640 free tools — no signup required.
Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.
Tip Calculator
Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.
Combinations Calculator
Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).
Combinations with Replacement Calculator
Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).
Even Permutations Calculator
Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.
Factorial Calculator
Calculate n! (n factorial) — the product of all positive integers from 1 to n.
Fibonacci Calculator
Generate Fibonacci sequence. Enter how many terms you need. F(n) = F(n-1) + F(n-2).
Multi-Factorial Calculator
Calculate double factorial (n!!), triple factorial (n!!!), and higher. n!! = n × (n−k) × (n−2k) × ...
Odd Permutations Calculator
Count how many permutations of n objects are odd (expressible as an odd number of swaps). For n ≥ 2, equals n!/2.
Pascal's Triangle Calculator
Generate Pascal's triangle. Each row gives binomial coefficients. Used in combinatorics and algebra.
Permutations Calculator
Calculate P(n,r) — the number of ways to arrange r items from n with order. Uses n!/(n-r)!.
Circular Permutations Calculator
Calculate the number of ways to arrange n distinct objects in a circle. Formula: (n-1)!.
Permutations with Replacement Calculator
Calculate the number of ways to arrange r items from n with repetition allowed. Formula: n^r.
Absolute Difference Calculator
Calculate the absolute difference between two numbers: |a − b|.
Absolute Value Calculator
Calculate the absolute value |x| of any number.
Completing the Square Calculator
Convert ax² + bx + c to vertex form a(x − h)² + k and find the vertex.
Cube Calculator
Calculate the cube of a number: x³ = x × x × x.
Perfect Cubes List
List perfect cubes (0³, 1³, 2³, …) and check if a number is a perfect cube.
Cube Root Calculator
Calculate the cube root ∛x. Works for positive and negative numbers.
Cubic Equation Calculator
Solve cubic equations ax³ + bx² + cx + d = 0. Find real roots using numerical methods.
Difference of Two Squares Calculator
Factor a² − b² as (a + b)(a − b). Enter two numbers to see the identity.
Dot Product Calculator
Calculate the dot product of two vectors. Enter components for 2D or 3D vectors.
Exponent Calculator
Calculate base raised to an exponent: xⁿ. Supports integers and decimals.
Fraction Exponent Calculator
Calculate x^(m/n): the n-th root of x^m. Handles fractional exponents.
Solve for Exponent Calculator
Solve b^x = y for x (i.e. find x = log(y)/log(b)).
Fifth Root Calculator
Calculate the fifth root of a number: ⁵√x = x^(1/5).
FOIL Calculator
Expand (ax + b)(cx + d) using the FOIL method. First, Outer, Inner, Last.
Fourth Root Calculator
Calculate the fourth root of a number: ⁴√x = x^(1/4). Principal (non-negative) root for x ≥ 0.
Large Exponent Calculator
Calculate very large powers (e.g. 2^1000) using BigInt. Handles integers only.
Logarithm Equation Calculator
Solve log_base(x) = y for x (x = base^y) or for the exponent. Common and natural log supported.
Percent Change Calculator
Calculate percent change from old value to new value: ((new − old) / old) × 100.
Percent Difference Calculator
Calculate percent difference between two values: 2|a − b| / (a + b) × 100. Symmetric comparison.
Percent Error Calculator
Calculate percent error: |measured − actual| / actual × 100. Used in labs and quality checks.
Percentage Decrease Calculator
Find the value after a percentage decrease: new = original × (1 − p/100).
Percentage Increase Calculator
Find the value after a percentage increase: new = original × (1 + p/100).
Quadratic Formula Calculator
Solve quadratic equations ax² + bx + c = 0 using the quadratic formula. Get real and complex roots.
Radical Calculator
Calculate the n-th root of x: ⁿ√x = x^(1/n). Supports any positive integer n.
Simplify Radicals Calculator
Simplify √n to the form a√b where b is square-free. Integer radicands only.
Square Calculator
Calculate the square of a number: x² = x × x.
Square Roots Calculator
Calculate square roots (√x). Get the principal (positive) root and see if the number is a perfect square.
Square Footage Calculator
Calculate area in square feet from length and width. Use for flooring, painting, or land area.
Concrete Calculator
Estimate cubic yards of concrete needed for slabs, footings, or columns. Enter length, width, and depth.
Gravel Calculator
Estimate cubic yards of gravel or crushed stone needed. Enter length, width, and depth in inches.
Paint Calculator
Estimate gallons of paint needed from wall area and coverage. Supports multiple coats.
Cubic Feet Calculator
Calculate volume in cubic feet from length, width, and height. Use for shipping, storage, or room volume.
Cubic Yards Calculator
Calculate volume in cubic yards from length, width, and height in feet. Common for concrete and bulk materials.
Mulch Calculator
Estimate cubic yards of mulch needed for beds or landscaping. Enter area and depth in inches.
Topsoil Calculator
Estimate cubic yards of topsoil needed for lawns or raised beds. Enter length, width, and depth.
Feet and Inches Calculator
Add, subtract, or convert feet and inches. Enter values in ft and in; get results and decimal feet.
Roadway / Asphalt Calculator
Estimate tons of asphalt or road base needed. Enter length, width, depth, and density (or use default).
Tank Volume Calculator
Calculate volume of rectangular or cylindrical tanks. Enter dimensions in feet; get cubic feet and gallons.
Compound Interest Calculator
Calculate compound interest: principal, rate, time, and compounding frequency.
Discount Calculator
Calculate discounted price from original price and discount percentage.
GST Calculator
Add or remove GST from a price. Calculate GST amount and total.
Mortgage Calculator
Estimate monthly mortgage payment from loan amount, interest rate, and term in years.
Simple Interest Calculator
Calculate simple interest: I = P × r × t. Principal, rate, and time.
VAT Calculator
Add or remove VAT from a price. Calculate VAT amount and total.
Car Loan Calculator
Calculate monthly car loan payment from loan amount, APR, and term.
Compound Interest Calculator
Calculate future value with compound interest. Principal, rate, time, compounding frequency.
Compound Interest Calculator (Periodic Contributions)
Calculate future value with compound interest and regular periodic contributions.
EMI Loan Calculator
Calculate Equated Monthly Installment (EMI) for a loan. Principal, rate, and term.
Hourly to Salary Calculator
Convert hourly wage to annual salary. Enter hourly rate and hours per week.
Loan Calculator Index
Quick loan payment estimate. Enter loan amount, annual rate, and term in months for monthly payment.
Interest-Only Mortgage Calculator
Calculate monthly interest-only payment. Principal and annual rate.
Loan Calculator
Calculate monthly loan payment. Enter principal, annual interest rate, and term in months.
Advanced Loan Calculator
Loan payment with optional down payment and compound frequency. Full amortization summary.
Simple Loan Calculator
Quick monthly payment estimate. Principal, annual rate, term in months.
Mortgage Calculator
Estimate monthly mortgage payment. Loan amount, interest rate, and term in years.
Profit Margin Calculator
Calculate profit margin percentage from cost and revenue (or selling price).
Salary to Hourly Calculator
Convert annual salary to hourly wage. Enter salary and hours worked per week.
Reverse Sales Tax Calculator
Find price before tax from a total that includes sales tax. Enter total and tax rate.
Sales Tax Calculator (State & Local)
Add state and local sales tax to a price. Enter price and tax rate(s).
Simple Interest Calculator
Calculate simple interest: I = P × r × t. Principal, rate, time in years.
Age Calculator
Calculate your age in years, months, and days from your birth date to today (or a target date).
Chronological Age Calculator
Calculate chronological age in years, months, and days from birth date to a given date.
Gas Mileage Calculator
Calculate miles per gallon (MPG) or fuel economy. Enter distance and fuel used.
Stopwatch
Simple stopwatch: start, pause, and reset. Elapsed time in hours, minutes, seconds.
BMI Calculator
Calculate Body Mass Index from weight and height. Metric (kg, cm) or imperial (lb, in).
BMI Calculator for Women
Calculate BMI for women. Same formula as standard BMI; interpretation may use gender-specific guidelines.
Average Calculator
Calculate the average (mean) of a list of numbers. Enter numbers separated by commas or spaces.
Body BMI Calculator
Calculate Body Mass Index from weight (kg) and height (cm).
Discount Calculator
Calculate sale price after a discount percentage. Original price and discount %.
GST Calculator
Add or remove GST from a price. Enter amount and GST rate %.
Quadratic Equation Calculator
Solve ax² + bx + c = 0. Enter coefficients a, b, c for real roots.
Square Root Calculator
Calculate the square root of a number. Supports decimals and whole numbers.
Adding Fractions Calculator
Add two fractions. Enter numerators and denominators; result in simplest form.
Average (Mean) Calculator
Calculate the arithmetic mean of a list of numbers.
Dividing Fractions Calculator
Divide two fractions. Enter numerators and denominators; result in simplest form.
Fractions Calculator
Add, subtract, multiply, or divide two fractions. Result in simplest form.
Multiplying Fractions Calculator
Multiply two fractions. Enter numerators and denominators; result in simplest form.
Percentage Calculator
Calculate what is X% of Y, or X is what percent of Y.
Random Number Generator
Generate a random integer between a minimum and maximum (inclusive).
Simplifying Fractions Calculator
Simplify a fraction to lowest terms. Enter numerator and denominator.
Standard Deviation Calculator
Calculate sample or population standard deviation and variance from a list of numbers.
Subtracting Fractions Calculator
Subtract two fractions. Enter numerators and denominators; result in simplest form.
Weighted Average Calculator
Calculate weighted average. Enter values and their weights (e.g. grades and credits).
Percentage Calculator
Find what is X% of Y, or what percent X is of Y. Simple percentage calculations.
Probability Calculator
Calculate simple probability: P(event) = favorable outcomes / total outcomes.
Sales Tax Calculator
Add sales tax to a price. Enter price and tax rate %.
Adding Fractions Calculator
Add two fractions. Enter numerators and denominators; get result in simplest form.
Decimal to Fraction Calculator
Convert a decimal number to a fraction in simplest form.
Decimal to Percent Calculator
Convert a decimal to a percentage. Multiply by 100.
Fraction to Decimal Calculator
Convert a fraction to a decimal. Enter numerator and denominator.
Fraction to Percent Calculator
Convert a fraction (numerator/denominator) to a percentage.
Fractions Calculator
Add, subtract, multiply, or divide two fractions. Result in simplest form.
Fractions Calculators
Add, subtract, multiply, or divide two fractions. One operation at a time, result in simplest form.
Mixed Number to Percent Calculator
Convert a mixed number (e.g. 1 1/4) to a percentage.
Simplifying Complex Fractions Calculator
Simplify a complex fraction (a/b)/(c/d) to a single fraction in lowest terms.
Binary to Decimal Converter
Convert a binary number to decimal.
Decimal to Binary Converter
Convert a decimal number to binary.
Decimal to Fraction Converter
Convert a decimal number to a fraction in simplest form.
Decimal to Hex Converter
Convert a decimal number to hexadecimal.
Fraction to Decimal Converter
Convert a fraction (numerator/denominator) to a decimal.
Hex to Decimal Converter
Convert a hexadecimal number to decimal.
College GPA Calculator
Calculate your college GPA from letter grades and credit hours.
Final Grade Calculator
Find what grade you need on the final to reach a desired course grade.
GPA Calculator
Calculate GPA from letter grades and credit hours.
GPA to Letter Grade Calculator
Convert a GPA (0–4) to the equivalent letter grade.
Grade Calculator
Calculate weighted average grade from course grades and credits.
High School GPA Calculator
Calculate your high school GPA from letter grades and credit hours.
Letter Grade to GPA Calculator
Convert a letter grade to the equivalent GPA value (4.0 scale).
Final Grade Calculator
Calculate your final course grade from current grade and final exam, or find the grade needed on the final.
GPA Calculator
Calculate your GPA from letter grades and credit hours (4.0 scale).
Grade Calculator
Calculate weighted average grade from multiple grades and credits.
Mean Median Mode Calculator
Calculate mean, median, and mode from a list of numbers.
Standard Deviation Calculator
Calculate mean, variance, and standard deviation (sample or population) from a list of numbers.
Vote Percentage Calculator
Calculate the percentage of votes for a candidate or option out of total votes.
Age Calculator (Time)
Calculate age in years, months, and days from birth date to today or a target date.
Countdown Timer
Count down to a target date and time. See days, hours, minutes, and seconds remaining.
Date Difference Calculator
Calculate the difference between two dates in days, months, or years.
Stopwatch Timer
Simple stopwatch: start, pause, and reset. Elapsed time in hours, minutes, seconds.
Time and Date Difference Calculator
Calculate the difference between two dates and times in days, hours, minutes, and seconds.
Random Number Generator
Generate a random integer between a minimum and maximum (inclusive).
CM to Inches Converter
Convert centimeters to inches. Quick and accurate length conversion.
Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius. Formula: C = (F − 32) × 5/9.
Inches to CM Converter
Convert inches to centimeters. 1 inch = 2.54 cm.
Kilograms to Pounds Converter
Convert kilograms to pounds. 1 kg = 2.205 lb.
Meters to Feet Converter
Convert meters to feet. 1 m ≈ 3.28084 ft.
Pounds to Kilograms Converter
Convert pounds to kilograms. 1 lb ≈ 0.453592 kg.
CM to Inch Converter
Convert centimeters to inches. Simple and accurate length conversion.
Feet to Meter Converter
Convert feet to meters. 1 ft = 0.3048 m.
KM to Mile Converter
Convert kilometers to miles. 1 km ≈ 0.6214 miles.
Mile to KM Converter
Convert miles to kilometers. 1 mile ≈ 1.60934 km.
Compound Interest Formula
Understand and calculate compound interest. A = P(1 + r/n)^(nt). Calculator included.
Future Value Calculator
Calculate future value with compound interest. Enter principal, rate, compounding, and time.
Future Value Calculator (Basic)
Simple future value calculation. Principal, rate, and time in years.
Future Value Investment Calculator
Calculate future value with optional periodic contributions. Compound interest plus regular deposits.
Savings Calculators
Simple and compound savings calculators. See how your savings grow over time.
Inflation Calculator
See how much a sum will be worth in the future given an inflation rate. Amount × (1 + rate)^years.
Investment Calculator
Calculate future value with initial investment and regular contributions. Compound growth over time.
Investment Inflation Calculator
Combine investment growth and inflation. See real (inflation-adjusted) future value.
Markup Calculator
Calculate selling price from cost and markup %, or find markup % from cost and selling price.
Net Present Value Calculator
Calculate NPV from initial investment, discount rate, and comma-separated cash flows. NPV = -C0 + sum(Ct/(1+r)^t).
Present Value Calculator
Calculate present value of a single future amount. PV = FV / (1 + r)^n.
Present Value Calculator (Basic)
Simple present value of a single future amount. PV = FV / (1 + r)^n.
Present Value Investment Calculator
Calculate present value of multiple cash flows with a discount rate. Enter comma-separated cash flows.
Profit Calculator
Calculate profit and profit margin from revenue and cost. Profit = revenue - cost; margin % = profit / revenue × 100.
Retirement Savings Calculator
Estimate future value at retirement: current age, retirement age, current savings, monthly contribution, annual return %.
Return on Investment (ROI) Calculator
Calculate ROI percentage from initial investment and final value (or gain). ROI = (final - initial) / initial × 100.
Salary Inflation Calculator
Estimate future salary with inflation. Future salary = current salary × (1 + inflation rate)^years.
Savings Calculator
Compound savings: initial amount, monthly deposit, annual rate %, and years. Computes future value.
Hours Calculator
Add or subtract time in hours and minutes. Enter times like 2:30 or 1:45 to get total hours:minutes.
Circle Calculator
From radius find area and circumference. Area = πr², circumference = 2πr.
Midpoint Calculator
Find the midpoint of a line segment. Given (x1,y1) and (x2,y2), midpoint = ((x1+x2)/2, (y1+y2)/2).
Pythagorean Theorem Calculator
Right triangle: enter two legs to get hypotenuse c = √(a²+b²), or enter hypotenuse and one leg to get the other leg.
Slope Calculator
Slope between two points (x1,y1) and (x2,y2). Slope = (y2 - y1) / (x2 - x1).
Triangle Law of Cosines Calculator
Given two sides a, b and included angle C (degrees): find side c. Or given three sides: find angle C.
Triangle Law of Sines Calculator
Solve triangle using law of sines: two angles and a side, or two sides and a non-included angle. a/sin(A) = b/sin(B) = c/sin(C).
Triangle Theorems
Triangle facts: angles sum to 180°. Enter two angles to find the third, or see key formulas.
Equilateral Triangle Calculator
From side length find area, height, and perimeter of an equilateral triangle.
Isosceles Triangle Calculator
Two equal sides and base (or base and height): find area and perimeter of an isosceles triangle.
Right Triangle Calculator
Two legs → hypotenuse and area; or one leg and hypotenuse → other leg. Uses Pythagorean theorem.
Surface Area Calculator
Surface area of cube (side), sphere (r), cylinder (r, h), or cone (r, h). Select shape and enter dimensions.
Volume Calculator
Volume of cube, sphere, cylinder, or cone. Select shape and enter dimensions.
Pace Calculator
From distance (e.g. miles) and time (e.g. 0:25:00 for 25 min), get pace per unit (min:sec per mile).
Target Heart Rate Zone Calculator
From age get max HR ≈ 220 - age, then heart rate zones (e.g. 50-60%, 60-70%, 70-80%, 80-90% of max).
Confidence Interval Calculator
CI for mean: mean, standard deviation, sample size n, confidence % (90/95/99). CI = mean ± z × (s/√n).
Pythagorean Theorem Calculator (Math)
Right triangle: two legs a, b → hypotenuse c = √(a²+b²). Or hypotenuse c and one leg → other leg.
Right Triangle Calculator
Solve right triangles: enter two legs or one leg and hypotenuse to get the other side and angles in degrees.
Scientific Notation Calculator
Convert between numbers and scientific notation (e.g. 1.5e6). Bidirectional conversion.
Variance Calculator
Enter a comma-separated list of numbers to get population and sample variance.
Percent to Decimal Calculator
Convert a percent value to a decimal (e.g. 50% → 0.5).
Percent to Fraction Calculator
Convert a percent to a fraction in lowest terms (e.g. 75% → 3/4).
Scientific Notation Converter
Convert a number to scientific notation, or convert scientific notation (e.g. 1.5e6) to decimal.
Speed Distance Time Calculator
Given two of speed, distance, and time, solve for the third using s = d/t, d = s×t, t = d/s.
Decimal to Percent Converter
Convert a decimal number to a percent (e.g. 0.5 → 50%).
Fraction to Percent Converter
Enter numerator and denominator to convert a fraction to a percent.
Percent to Decimal Converter
Convert a percent to a decimal (e.g. 50% → 0.5).
Percent to Fraction Converter
Convert a percent to a fraction in lowest terms (e.g. 75% → 3/4).
Scientific Notation Converter
Convert between scientific notation (e.g. 1.5e6) and decimal numbers. Bidirectional.
Kinetic Energy Calculator
Calculate kinetic energy KE = ½mv² from mass (kg) and velocity (m/s). Result in joules.
Velocity Calculator (v = u + at)
Calculate final velocity from initial velocity u, acceleration a, and time t: v = u + a×t.
Work Calculator
Calculate work W = F×d from force (N) and distance (m). Result in joules.
Final Grade Calculator
Find the required final exam score: enter current grade %, final exam weight %, and desired course grade %.
Percentile Calculator
Enter a list of numbers and a percentile (e.g. 90) to get the value at that percentile (linear interpolation).
Variance Calculator
Enter comma-separated numbers to compute population and sample variance.
Z-Score Calculator
Compute z = (x − mean) / std dev from value, mean, and standard deviation.
Work Hours Calculator
Calculate total hours from start and end time, or from a list of shifts (e.g. 9:00-17:00).
Trigonometric Functions (Degrees)
Get sin, cos, and tan for an angle in degrees, or view a table of values from 0° to 360°.
Trigonometric Functions (Radians in π)
Get sin, cos, and tan for an angle in radians as a multiple of π (e.g. π/2, π/4).
Inverse Trigonometric Functions
Enter a value (−1 to 1 for asin/acos) to get the angle in degrees: arcsin, arccos, arctan.
Trigonometric Functions Calculator
Enter an angle in degrees to get sin, cos, and tan values.
Trigonometric Functions (Radians)
Enter an angle in radians (e.g. π/2, 1.57) to get sin, cos, and tan.
Binary to Hex Converter
Convert binary string (0s and 1s) to hexadecimal. Handles padded or space-separated binary.
Hex to Binary Converter
Convert hexadecimal string to binary (0s and 1s). Handles with or without 0x prefix.
Words to Pages Converter
Estimate page count from word count using a configurable words-per-page (e.g. 250).
Area Calculator
Calculate area for rectangle, circle, and triangle. Enter dimensions and get area instantly.
Speed Converter
Convert between speed units: km/h, mph, m/s, knots, ft/s. Enter a value and get instant conversions.
Temperature Converter
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Enter a value and see all three scales.
CM to Feet Converter
Convert centimeters to feet (decimal). Enter cm and get the equivalent in feet.
CM to Feet and Inches
Convert centimeters to feet and inches (e.g. 170 cm → 5 ft 7 in). Common for height.
Feet to CM Converter
Convert feet to centimeters. Enter feet (decimal) and get the equivalent in cm.
Feet to KM Converter
Convert feet to kilometers. Enter feet and get the equivalent in km.
Height Converter
Convert height between feet/inches and centimeters. Enter in one unit, get the other.
KM to Feet Converter
Convert kilometers to feet. Enter km and get the equivalent in feet.
Degrees to Radians Converter
Convert angle from degrees to radians. Formula: radians = degrees × π / 180.
Radians to Degrees Converter
Convert angle from radians to degrees. Formula: degrees = radians × 180 / π.
Effective Interest Rate Calculation
Convert nominal annual rate to effective annual rate using (1 + r/n)^n - 1 with compounding periods per year.
Effective Interest Rate Calculator
Convert nominal annual rate and compounding periods per year to effective annual rate (EAR) as a percentage.
Amortization Equal Principal Payments Calculator
Loan amount, annual rate, and term in years: get equal principal per period plus interest per period (summary or table).
Amortization Schedule Calculator
Generate full amortization schedule: loan amount, rate %, term in months. Payment, principal, interest, and balance for each period.
APR Calculator
Estimate APR from loan amount, optional fees, interest rate, and term. Uses approximate formula (2×n×I)/(P×(N+1)) or standard method.
APR Calculator Basic
Simple APR calculator: loan amount, rate, and term. Get approximate APR with minimal inputs.
CAGR Calculator
Compound Annual Growth Rate: beginning value, ending value, and years. CAGR % = (end/start)^(1/years) - 1.
Checkbook Balance Calculator
Starting balance plus a list of transactions (one per line: +amount or -amount). See running balance after each transaction.
Checkbook Calculator
Starting balance plus a list of transactions (one per line: +amount or -amount). Get final balance.
Currency Appreciation Depreciation Calculator
Original exchange rate and new rate: compute percentage appreciation or depreciation of a currency.
Depreciation Activity Method Calculator
Cost, salvage value, total units of production, and units used this period. Depreciation expense using the activity (units of production) method.
Depreciation Calculator
Cost, salvage value, and useful life in years. Annual straight-line depreciation.
Depreciation Declining Balance Calculator
Cost, salvage value, useful life, and decline rate %. Declining balance depreciation per period.
Double Declining Balance Depreciation Calculator
Cost, salvage value, and useful life. Double-declining balance (DDB) depreciation per year.
Fixed Declining Balance Depreciation Calculator
Cost and fixed declining balance rate %. Book value and depreciation each period (fixed % applied to remaining book value).
Real Estate Property Depreciation Calculator
Cost and recovery period (e.g. 27.5 years for residential rental). Annual straight-line real estate depreciation.
Straight Line Depreciation Calculator
Cost, salvage value, and useful life. Annual straight-line depreciation amount.
Sum of Years Digits Depreciation Calculator
Cost, salvage value, and useful life. Sum-of-years-digits depreciation per year (front-loaded).
Units of Production Depreciation Calculator
Cost, salvage value, total units expected, and units used this period. Depreciation expense (units of production method).
Variable Declining Balance Depreciation Calculator
Cost, salvage value, useful life, and variable decline rate %. Variable declining balance depreciation per period.
Effective Interest Rate Calculator
Nominal annual rate and compounding periods per year. Get effective annual rate (EAR) as a percentage.
Index: Depreciation Calculators
Overview of depreciation calculator types: straight-line, declining balance, units of production, sum-of-years-digits, and more.
Index: Financial Ratio Calculators
Overview of financial ratio calculator types: liquidity, profitability, leverage, efficiency, and valuation ratios.
Index: Interest and APR Calculators
Overview of interest and APR calculator types: effective rate, APR, amortization, compound interest, and related tools.
Property Tax Calculator
Assessed value and tax rate (mill rate or percentage). Calculate property tax due.
Aspect Ratio Calculator
Enter width and height to get aspect ratio (e.g. 16:9) and the GCD-reduced ratio.
PPI Calculator
Calculate pixels per inch from screen width, height (px), and diagonal (inches). PPI = √(width² + height²) / diagonal.
ASCII to Decimal Converter
Convert a character or ASCII code to its decimal value (e.g. A → 65).
Decimal to ASCII Converter
Convert a decimal number (0–255) to its ASCII character.
Parallelogram Calculator
Calculate area from base and height, or from two sides and included angle. Area = base × height or a × b × sin(θ).
Polygon Calculator
Calculate area and perimeter of a regular polygon from number of sides and side length (or circumradius).
Rectangle Calculator
Calculate area, perimeter, and diagonal from length and width.
Rhombus Calculator
Calculate area and perimeter from diagonals, or from side and height. Area = (d₁×d₂)/2 or side×height.
Cone Calculator
Calculate volume, slant height, and surface area of a right circular cone from radius and height.
Cylinder Calculator
Calculate volume and surface area of a right circular cylinder from radius and height.
Hemisphere Calculator
Calculate volume and curved surface area of a hemisphere from radius. Volume = (2/3)πr³, curved area = 2πr².
Sphere Calculator
Calculate volume and surface area of a sphere from radius. Volume = (4/3)πr³, surface = 4πr².
Conception Calculator
Estimate conception date from due date (≈266 days before) or from last menstrual period (LMP) date (≈14 days after LMP).
Arccos Calculator
Inverse cosine: enter a value from -1 to 1 to get the angle in degrees. arccos(x) = angle whose cosine is x.
Arcsin Calculator
Inverse sine: enter a value from -1 to 1 to get the angle in degrees. arcsin(x) = angle whose sine is x.
Arctan Calculator
Inverse tangent: enter a value to get the angle in degrees. arctan(x) = angle whose tangent is x.
Cosine Calculator
Calculate cosine of an angle. Enter angle in degrees to get cos(angle).
Factorial Calculator
Calculate n! (n factorial) for non-negative integers. n! = n × (n-1) × … × 1; 0! = 1.
Logarithm Calculator
Calculate logarithm: log_base(value). Enter value and base to get log_base(value). Natural log (base e) when base is e or left blank.
Sine Calculator
Calculate sine of an angle. Enter angle in degrees to get sin(angle).
Tangent Calculator
Calculate tangent of an angle. Enter angle in degrees to get tan(angle).
Antilog Calculator
Calculate antilog: base^value. Enter value and base to get base raised to the power of value.
Exponent Calculator
Calculate base^exponent. Enter base and exponent to get the power result.
GCF Calculator
Find the Greatest Common Factor (GCF), also called GCD, of two integers. GCF is the largest positive integer that divides both numbers.
LCM Calculator
Find the Least Common Multiple (LCM) of two positive integers. LCM is the smallest positive integer divisible by both numbers.
Percent Error Calculator
Calculate percent error between measured and actual (or accepted) value. Percent error = |measured - actual| / actual × 100.
Ratio Calculator
Simplify ratio a:b, and show ratio as fraction and percentage. Enter two numbers to get the ratio in simplest form and equivalent fraction/percent.
PayPal Fee Calculator
Calculate PayPal fees (e.g. 2.9% + $0.30) from amount received or sent. See net and gross amounts.
GCF Calculator
Find the Greatest Common Factor (GCF) of two integers. Same as GCD — the largest positive integer that divides both.
GCF Euclid's Algorithm
Find the Greatest Common Factor of two integers using Euclid's algorithm. Optionally show step-by-step work.
Golden Ratio Calculator
Given one number, find the other so that their ratio equals φ (golden ratio ≈ 1.618). Or display φ.
LCM Calculator
Find the Least Common Multiple (LCM) of two integers. LCM is the smallest positive integer divisible by both.
Modulo Calculator
Compute a mod b: the remainder when a is divided by b. Handles negative numbers with standard remainder behavior.
Prime Factorization Calculator
Decompose an integer into its prime factors. See the full factorization (e.g. 60 = 2² × 3 × 5).
Prime Number Calculator
Check if a given integer n is prime. A prime has exactly two positive divisors: 1 and itself.
Prime Numbers List
List all prime numbers in a given range [min, max]. Useful for math and programming.
Friction Calculator
Compute friction force F = μN from coefficient of friction μ and normal force N. Simple physics calculator.
Ideal Gas Law Calculator
Solve PV = nRT: enter three of P (pressure), V (volume), n (moles), T (temperature) and get the fourth. R = 8.314 J/(mol·K).
Impulse Calculator
Compute impulse J = F × Δt (force × time) or J = m × Δv (mass × change in velocity). Units: N·s or kg·m/s.
Impulse–Momentum Calculator
Relate impulse to change in momentum: impulse = Δp = m·Δv = F·Δt. Solve for any one quantity given the others.
Wavelength Calculator
Convert between frequency f (Hz) and wavelength λ: λ = c/f where c = 3×10⁸ m/s (speed of light).
Descriptive Statistics Calculator
Enter comma-separated numbers to get mean, median, mode, variance, standard deviation, min, and max.
Quartile Calculator
Compute Q1, Q2 (median), Q3, and IQR from comma-separated numbers. IQR = Q3 − Q1.
Sum Calculator
Add comma-separated numbers and get the sum. Quick total for a list of values.
Birthday Calculator
Enter your birth date to see age in years and days, or countdown to your next birthday.
Month Calendar
View a month calendar for any year and month. Client-side calendar grid (no server).
Day of the Week Calculator
Enter any date and get the day of the week (e.g. Monday, Tuesday).
Decimal to Time Calculator
Convert decimal hours (e.g. 2.5) to hours and minutes (e.g. 2:30). Useful for timesheets and payroll.
Government Shutdown Countdown
US government shutdown countdown: enter a target date (e.g. funding deadline) to see time remaining, or use a placeholder date.
How Old Am I?
Enter your birth date to get your exact age in years, months, and days.
Military Time Chart
Reference chart for 12-hour (AM/PM) to 24-hour (military) time conversion. Quick lookup table.
Military Time Converter
Convert between 12-hour time (AM/PM) and 24-hour military time. Enter a time and get the equivalent in the other format.
Time Clock Calculator
Calculate elapsed time between start and end, or add multiple time entries for a total. Useful for timesheets and work hours.
Time to Decimal Hours Calculator
Convert hours:minutes (e.g. 2:30) to decimal hours (e.g. 2.5) for payroll and time tracking.
ASCII to Binary Converter
Convert characters or text to 8-bit binary. Each character becomes its ASCII binary representation.
ASCII to Hex Converter
Convert characters or text to hexadecimal codes. Each character becomes its ASCII hex value.
Binary to ASCII Converter
Convert 8-bit binary strings to characters. Each 8-bit group becomes one ASCII character.
Hex to ASCII Converter
Convert hexadecimal codes to characters. Each pair of hex digits becomes one ASCII character.
Cubic Feet to Cubic Yards
Convert volume from cubic feet to cubic yards. Divide by 27 (1 yd³ = 27 ft³).
Cubic Yards to Cubic Feet
Convert volume from cubic yards to cubic feet. Multiply by 27 (1 yd³ = 27 ft³).
Annuity Table
Generate an annuity factor table from interest rate and periods. PV or FV annuity factors.
Bid Ask Calculator
Enter bid and ask prices to get spread and spread percentage.
Debt Ratios Calculator
Enter total debt and total assets or equity to compute debt ratio and related ratios.
Deferred Fixed Annuity Calculator
Calculate payout for a deferred fixed annuity: principal, rate, years, and deferral period.
Future Value Annuity Calculator
Calculate future value of an annuity: payment, rate, and number of periods.
Future Value Table Annuity
Generate a future value annuity factor table from rate and number of periods.
Interest Rate Table
Static or simple table of interest rates vs period. Reference table for rate and period.
Layaway Plan Calculator
Calculate payment per month for a layaway plan: price, deposit, and number of months.
Liquidity Ratios Calculator
Enter current assets and current liabilities to get current ratio and quick ratio.
Nominal Interest Rate Calculator
Convert effective annual rate to nominal rate given compounding periods per year.
Periodic Interest Rate Calculator
Convert annual interest rate to periodic rate: annual rate and periods per year.
Present Value Annuity Calculator
Calculate present value of an ordinary annuity from payment, rate, and number of periods.
Present Value Annuity Factor Table
Generate a table of present value annuity factors for given rates and number of periods.
Profitability Ratios Calculator
Compute profit margin, ROE, ROA, and other profitability ratios from financial inputs.
Stock Ratios Calculator
Calculate P/E ratio, dividend yield, and other stock ratios from price, EPS, and dividend.
Bingo Card Generator
Generate random 5×5 bingo cards with numbers 1–75 (B: 1–15, I: 16–30, N: 31–45, G: 46–60, O: 61–75).
Bingo Number Generator
Generate random bingo numbers from 1 to 75 (B-I-N-G-O columns).
Dice Roller
Roll one or more dice (e.g. d6, d20). Choose sides and count, see the result.
Lottery Number Generator
Generate random lottery numbers with configurable range and count (no repeats).
Poker Calculator
Basic poker odds and hand rank helper. Enter your hand and board for a simplified evaluation.
Poker Hands
View poker hand rankings and list from best to worst (royal flush to high card).
Sudoku Calculator
Simple sudoku helper: check one row or column sum (1–9 = 45) or validate a set of nine digits.
Yu-Gi-Oh! Life Points Calculator
Track life points: start at 8000, add or subtract damage and healing.
Annulus Calculator
Calculate the area of an annulus (ring) from outer radius R and inner radius r. Area = π(R² − r²).
Capsule Calculator
Calculate volume and surface area of a capsule (cylinder with hemispherical ends).
Conical Frustum Calculator
Calculate volume and surface area of a conical frustum (truncated cone) from radii and height.
Pyramid Frustum Calculator
Calculate the volume of a pyramid frustum (truncated pyramid) from base areas or side lengths and height.
Tube Calculator
Calculate volume and surface area of a tube (hollow cylinder): outer radius R, inner r, height h.
Displacement Calculator (s = vt & s = v₀t + ½at²)
Calculate displacement: constant velocity s = vt or uniform acceleration s = v₀t + ½at².
Elastic Potential Energy Calculator
Calculate elastic potential energy U = ½kx² (spring: k = spring constant, x = displacement).
E = mc² Calculator
Calculate mass-energy equivalence: E = mc². Enter mass to get energy (c = speed of light).
Gravitational Potential Energy Calculator
Calculate gravitational potential energy U = -Gm₁m₂/r (two masses, distance r).
Coin Flipper
Flip a virtual coin: random heads or tails. Fair 50/50 outcome.
PIN Generator
Generate a random PIN (e.g. 4-digit or custom length). Useful for temporary codes.
Random Card Generator
Draw one or more random playing cards from a standard 52-card deck.
Statistics Formulas
Display common statistics formulas: mean, variance, standard deviation, and more.
Stem-and-Leaf Plot
Build a stem-and-leaf plot from a list of numbers. Enter numbers to see the plot.
Sunrise Sunset Calculator
Calculate sunrise and sunset times for any date and location (latitude/longitude) using a simple formula.
Binary Decoder
Decode binary strings to text (UTF-8). Paste a sequence of 0s and 1s to get the decoded result.
Roman Numeral Date Converter
Convert a year (e.g. 2024) to Roman numerals (MMXXIV). Quick and free.
MB to KB Converter
Convert between megabytes (MB) and kilobytes (KB). Enter a value and choose the direction.
Celsius to Rankine Converter
Convert Celsius (°C) to Rankine (°R). Formula: °R = °C × 9/5 + 491.67.
Fahrenheit to Rankine Converter
Convert Fahrenheit (°F) to Rankine (°R). Formula: °R = °F + 459.67.
Kelvin to Rankine Converter
Convert Kelvin (K) to Rankine (°R). Formula: °R = K × 9/5.
Percent to PPM Converter
Convert percent (%) to parts per million (PPM). Formula: PPM = percent × 10,000.
PPB to PPM Converter
Convert parts per billion (PPB) to parts per million (PPM). Formula: PPM = PPB ÷ 1,000.
PPM Converter
Convert between parts per million (PPM), percent (%), and parts per billion (PPB).
PPM to PPB Converter
Convert parts per million (PPM) to parts per billion (PPB). Formula: PPB = PPM × 1,000.
PPT to PPM Converter
Convert parts per trillion (PPT) to parts per million (PPM). Formula: PPM = PPT ÷ 1,000,000.
Rankine to Celsius Converter
Convert Rankine (°R) to Celsius (°C). Formula: °C = (°R − 491.67) × 5/9.
Rankine to Fahrenheit Converter
Convert Rankine (°R) to Fahrenheit (°F). Formula: °F = °R − 459.67.
Rankine to Kelvin Converter
Convert Rankine (°R) to Kelvin (K). Formula: K = °R × 5/9.
Simple Interest Calculator
Calculate simple interest I = P×r×t. Enter principal, annual rate, and time in years.
Adding Machine Calculator
Add numbers one by one and see a running total. Enter values and add to the sum.
Car Loan Payment Calculator
Calculate monthly car loan payment from loan amount, interest rate, and term using the PMT formula.
Certificate of Deposit (CD) Calculator
Calculate CD maturity value: principal, annual rate, and term (years or months) to get maturity value.
Currency Conversion Table
View or build a table of currency conversion rates. Enter base and quote currencies and rate to see conversions.
Currency Converter
Convert amount between currencies. Enter amount, from/to currency codes, and exchange rate (no API; user-provided or demo rates).
Effective Annual Rate (EAR) Calculator
Convert nominal annual rate and compounding frequency to Effective Annual Rate (EAR / APY).
Equivalent Interest Rate Calculator
Convert between nominal and effective rates, or between different compounding periods (e.g. annual to monthly equivalent).
Future Value of Cash Flows Calculator
Compute the future value of multiple cash flows at a given discount rate. Enter cash flows and rate.
Future Value of Investment Account Calculator
Calculate future value of regular deposits (annuity): periodic payment, rate, and number of periods.
Gross Pay Calculator
Calculate gross pay from hours worked and hourly rate, or from salary (annual/monthly).
How Much Car Can I Afford?
Estimate maximum car loan amount from your monthly budget, interest rate, and loan term.
How Much House Can I Afford?
Estimate maximum mortgage amount from income, debt-to-income ratio (DTI), interest rate, and term.
How Much Loan Can I Afford?
Find maximum loan amount from the monthly payment you can make, interest rate, and term.
Index: Money & Tax Calculators
Overview of tax and money-related calculators: income tax, sales tax, GST, payroll, and related tools.
Index: Personal Finance & Accounting
Overview of personal finance and accounting tools: budgets, loans, savings, mortgages, and related calculators.
Index: Sales Calculators
Overview of sales-related calculators: markup, markdown, list price, discount, sales tax, and related tools.
Index: Time Value of Money (TVM) Calculators
Overview of time value of money tools: present value, future value, annuities, cash flows, and related calculators.
List Price & Markdown Calculator
Calculate sale price from list price and markdown percentage. Sale price = List × (1 − markdown%).
Loan Payment Table (Amortization)
Generate an amortization table: loan amount, rate, term → monthly payment, principal, interest, and balance for each period (first rows + summary).
Loan Repayment Calculator
Calculate loan payment schedule: loan amount, rate, term → monthly payment, total interest, and total amount repaid.
Money Calculator
Add and subtract multiple money amounts. Enter values one per line or comma-separated and see the total.
Mortgage Payment Calculator
Calculate monthly mortgage payment from principal (P), annual rate (r), and term in years (n). PMT = P × [r(1+r)^n] / [(1+r)^n − 1].
Mortgage Repayment Calculator
Calculate mortgage payment and optionally total interest with extra payments. Principal, rate, term → payment and repayment summary.
Operations Ratios Calculator
Calculate common operations ratios: inventory turnover, receivables turnover, days in inventory, days sales outstanding, and related metrics.
Present Value of Cash Flows Calculator
Compute the present value of multiple cash flows at a given discount rate. Enter cash flows and rate.
Present Value Formula Calculator
Calculate present value using PV = FV / (1 + r)^n. Future value, rate, and periods.
Price Calculator
Calculate selling price from cost plus margin or markup percentage.
Profit Goal Calculator
Find required revenue to hit a target profit given your costs.
Rule of 72 Calculator
Estimate years to double your money: 72 divided by annual rate.
Sale Price Calculator
Original price and discount percentage to final sale price.
Sales Calculator
Sales amount plus tax rate to get total with tax.
Savings Goal Calculator
Goal, current savings, monthly contribution, and rate to find time or monthly amount needed.
Selling Price Calculator
Calculate selling price from cost and margin percentage.
Service Tax Calculator (India)
Calculate service tax and total amount for India. Amount and service tax %.
Simple Interest Plus Principal Calculator
Calculate simple interest and total (interest + principal). P, r, t.
Federal Tax Estimator
Simplified estimated federal income tax based on taxable income and filing status.
Time Card Calculator
Enter clock in and clock out times to get hours worked.
Financial Calculators Index
List of financial calculator tools: loans, savings, present value, tax, and more.
Draft Pick Value Calculator
Simplified draft pick value by position (sports). Pick number to relative value.
Odds Calculator
Convert between odds formats and implied probability. American, decimal, fractional.
Keyword to Total Words Ratio Calculator
Paste text and a keyword to get keyword count and ratio (keyword count / total words).
YouTube Thumbnail URL Grabber
Paste a YouTube URL to get thumbnail image URLs (from video ID). No fetch, client-side only.
Distance Between Two Points Calculator
Enter (x1, y1) and (x2, y2) to get the distance. 2D distance formula.
Geometric Shapes Area and Perimeter Calculator
Pick a shape and enter dimensions to get area and perimeter. Circle, square, rectangle, triangle.
Square Calculator
Enter side length to get area and perimeter of a square.
Stadium Shape Area Calculator
Stadium (oval + rectangle) dimensions to approximate area. Length and width/radius.
Pyramid Volume Calculator
Base area and height to get volume of a pyramid. V = (1/3) × base area × height.
Rectangular Prism Calculator
Length, width, and height to get volume and surface area.
Triangular Prism Volume Calculator
Base (triangle base length), height of triangle, and prism length to get volume.
Binary Calculator
Add or subtract binary numbers, or convert between binary and decimal.
Earnings Per Share (EPS) Calculator
Net income and number of shares to get earnings per share. EPS = Net income / Shares.
Hex Calculator
Add or subtract hexadecimal numbers, or convert between hex and decimal.
LTV Calculator
Calculate customer lifetime value: revenue per customer and retention (e.g. average order value × purchase frequency × lifespan).
Margin Calculator
Calculate profit margin percentage from cost and price: margin % = ((price − cost) / price) × 100.
Add Numbers Calculator
Add two or more numbers. Enter numbers separated by spaces or one per line.
Natural Log Calculator
Calculate the natural logarithm ln(x) for any positive number.
Math Calculators Index
Overview of free online math calculators: basic arithmetic, fractions, percentages, roots, logarithms, trigonometry, and more.
Nth Root Calculator
Calculate the nth root of x: ⁿ√x = x^(1/n). Enter n and x to get the result.
Number Base Converter
Convert numbers between bases: binary (2), octal (8), decimal (10), and hexadecimal (16).
Binary Calculator
Add or subtract binary numbers. Enter two binary values and get the result in binary.
Simple Calculator
Free online 4-function calculator: add, subtract, multiply, and divide.
Complex Number Calculator
Add, subtract, or multiply two complex numbers. Enter real and imaginary parts.
Convolution Calculator
Compute the discrete convolution of two sequences: sum of products (f * g)[n] = Σ f[k]·g[n−k].
Division Calculator
Divide two numbers: a ÷ b. Get quotient and optional decimal result.
Exponential Growth Calculator
Calculate exponential growth: P(t) = P₀ × e^(rt). Enter initial value P₀, rate r, and time t.
Fraction Simplifier
Simplify a fraction to lowest terms. Enter numerator and denominator to get the simplified form.
Hex Math Calculator
Add or subtract hexadecimal numbers, or convert between hex and decimal.
Multiplication Calculator
Multiply two or more numbers. Enter numbers separated by spaces or one per line.
Percentage Change Calculator
Calculate percent change from old to new: ((new − old) / old) × 100. Positive = increase, negative = decrease.
Percentage Increase Calculator
Find the value after a percentage increase: new = original × (1 + p/100).
Remainder Calculator
Calculate the remainder when a is divided by b: a mod b. Same as the remainder in integer division.
Basic Calculator
Simple online calculator with addition, subtraction, multiplication, and division (+ − × ÷).
Subtraction Calculator
Subtract two numbers: a − b. Enter the minuend and subtrahend to get the difference.
Trigonometry Calculator
Calculate sin, cos, and tan for an angle. Enter angle in degrees or radians.
Octal Calculator
Add or subtract octal numbers, or convert between octal and decimal.
Pre and Post Money Valuation Calculator
Calculate pre-money and post-money valuation from investment amount and equity percentage, or derive one from the other.
Adding and Subtracting Integers Calculator
Add or subtract two integers. Handles positive and negative numbers with correct sign rules.
Basic Calculator
Simple online calculator for addition, subtraction, multiplication, and division.
Common Factors Calculator
Find all common factors of two numbers. Enter two integers to get the list of factors that divide both.
Complex Fraction Calculator
Simplify complex fractions of the form (a/b)/(c/d). Enter numerators and denominators to get the simplified result.
Diamond Problem Solver
Given the sum and product of two numbers (x+y and x×y), find x and y using the diamond method.
Expanded Form Calculator
Write a number in expanded form (e.g. 1234 = 1000 + 200 + 30 + 4). Supports whole numbers and decimals.
Factors Calculator
List all factors of a number. Enter a positive integer to see every divisor.
Fractions Average Calculator
Calculate the average of two or more fractions. Enter fractions as numerator/denominator (e.g. 1/2, 3/4).
Comparing Fractions Calculator
Compare two fractions to see which is greater, less, or if they are equal. Enter numerators and denominators.
Equivalent Fractions Calculator
Check if two fractions are equivalent or find equivalent fractions for a given fraction (e.g. 1/2 = 2/4 = 3/6).
Fraction Estimating Calculator
Estimate a fraction by rounding to the nearest 0, 1/2, or 1. Useful for quick mental math and number sense.
Fraction on Number Line
Show a fraction on a number line (visual position between 0 and 1, or custom range). Helps visualize fraction size.
Order Fractions Calculator
Order a list of fractions from least to greatest (ascending) or greatest to least (descending).
Simplify Fraction Calculator
Simplify a fraction to lowest terms. Enter numerator and denominator to get the reduced form (GCD).
Solve for X in Proportion Calculator
Solve x in a proportion a/b = c/x (or a/b = x/d). Find the missing value in equivalent fractions.
Fraction to Decimal Table
Generate a table of common fractions and their decimal equivalents (e.g. 1/2 = 0.5, 1/4 = 0.25).
Lattice Multiplication Calculator
Multiply two numbers using the lattice (grid) method. Step-by-step grid for multi-digit multiplication.
Least Common Denominator Calculator
Find the least common denominator (LCD) of two or more fractions. LCD is the LCM of the denominators.
Long Addition Calculator
Column addition for multiple numbers. Add several numbers with carry, written in column form (long addition).
Long Division Calculator
Long division step-by-step: divide one number by another and see quotient, remainder, and steps.
Long Division with Decimals
Long division that gives a decimal quotient. Divide two numbers and get the result with decimal places (no remainder).
Long Multiplication Calculator
Multiply two numbers using long multiplication (column method). Step-by-step partial products.
Linear Equation Solver
Solve simple linear equations of the form ax + b = c for x. Enter coefficients a, b, c.
Mixed Number to Decimal Calculator
Convert a mixed number (whole + fraction, e.g. 2 1/4) to a decimal. Enter whole part, numerator, and denominator.
Mixed Number to Improper Fraction
Convert a mixed number to an improper fraction. Enter whole, numerator, and denominator (e.g. 2 1/3 → 7/3).
Add and Subtract Mixed Numbers
Add or subtract two mixed numbers. Enter whole parts and fractions; result is shown as a mixed number or improper fraction.
Money Math Calculator
Add or subtract money amounts. Enter values with or without currency symbol (e.g. 10.50, $5.25).
Multiples Calculator
List the first N multiples of any number. Enter a number and limit to see its multiples.
Multiplication Tables
Generate multiplication tables (e.g. 1×1 to 12×12). Choose range and see the full table.
Number Word Notation to Standard
Convert number words (e.g. one hundred twenty-three) to standard numeric form.
Percentage Calculator
Find what percent one number is of another (part/whole), or find a percent of a number.
Place Value Calculator
Break a number into place values: ones, tens, hundreds, thousands, and decimal places.
Ratio Simplifier
Simplify a ratio a:b to its lowest terms using the GCD (e.g. 8:12 → 2:3).
Ratio to Fraction Calculator
Convert a ratio a:b to a fraction—either a/(a+b) (part of whole) or a/b.
Ratios Calculator (Proportion)
Solve for the missing term in two equal ratios (proportion): a:b = c:d. Enter three values to find the fourth.
Round to Nearest Multiple
Round a number to the nearest multiple (e.g. round 23 to nearest 5 → 25).
Rounding Methods Calculator
Round a number using different methods: half up, half down, half even (banker's), ceiling, floor.
Rounding Numbers
Round a number to a specified number of decimal places (half up).
Significant Figures Calculator
Count the number of significant figures in a given number.
Significant Figures Counter
Count significant figures in a number and see the rules: leading zeros, trailing zeros, and which digits count.
Significant Figures Rounding
Round a number to a specified number of significant figures.
Standard Form Calculator
Convert between standard decimal form and scientific notation (e.g. 1200 ↔ 1.2×10³).
Unit Rate Calculator
Find the rate per single unit: enter quantity and total cost (or other measure) to get rate per unit.
Acceleration Calculator
Calculate acceleration from velocity and time (a = v/t) or from force and mass (a = F/m).
Density Calculator
Calculate density from mass and volume: ρ = m/V. Enter mass and volume to get density.
Force Calculator
Calculate force from mass and acceleration: F = ma (Newton's second law).
Minutes to Decimal Converter
Convert minutes to decimal hours, or HH:MM time to decimal hours (e.g. 90 min → 1.5, 1:30 → 1.5).
Momentum Calculator
Calculate momentum from mass and velocity: p = mv. Enter mass and velocity to get momentum.
Pressure Calculator
Calculate pressure from force and area: P = F/A. Enter force and area to get pressure.
Roman Numeral Calculator
Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.
Weight Calculator
Calculate weight from mass and gravitational acceleration: W = mg. Enter mass and g to get weight.
Avoirdupois Weight Converter
Convert between avoirdupois weight units: ounces (oz), pounds (lb), and optionally grains, stones.
Troy Weight Converter
Convert between troy weight units: troy ounces (oz t), troy pounds (lb t). Used for precious metals.
Fraction to Decimal and Mixed Number Converter
Convert a fraction to decimal or to mixed number form.
Decimal to Octal Converter
Convert a decimal integer to octal (base 8).
Octal to Decimal Converter
Convert an octal (base 8) number to decimal.
Molecular Weight Calculator
Calculate molecular weight from a simple chemical formula (e.g. H2O, NaCl).
Displacement Calculator (v₀, a, t)
Calculate displacement using s = v₀t + ½at² (initial velocity, acceleration, time).
Displacement Calculator (Constant Velocity)
Calculate displacement using s = v × t (constant velocity and time).
Hooke's Law Calculator
Calculate spring force F = kx (spring constant × displacement).
Uniform Acceleration Calculator
Calculate final velocity v = v₀ + at and displacement s = v₀t + ½at².
Velocity Calculator (v = v₀ + at)
Calculate final velocity from initial velocity, acceleration, and time.
Average Velocity Calculator
Calculate average velocity as total displacement divided by total time.
Grade to GPA Calculation
Convert letter grades to GPA (grade point average) using a standard scale.
Score to Letter Grade Calculator
Convert a score or points to a letter grade based on a percentage scale.
Test Grade Calculator
Calculate percentage grade from score and total (e.g. test score out of total points).
Random Number Generator
Generate a random number within a specified range (min and max inclusive).
Random Name Picker
Enter a list of names and pick one at random (e.g. for games or draws).
Statistics Calculator
Calculate mean, median, mode, and standard deviation from a list of numbers.
Date Arithmetic Calculator
Add or subtract days from a date to get a new date.
Time Duration Calculator
Calculate the duration between two times (e.g. start and end time).
Age Calculator
Calculate age in years (and optionally months/days) from birth date to today.
Day of Week Calculator
Find the day of the week for any date (e.g. Monday, Tuesday).
Hours Converter and Sum
Convert hours and minutes to decimal hours (e.g. 2h 30m → 2.5) or sum time in decimal form.
Hours and Minutes Calculator
Add or subtract hours and minutes (e.g. 2h 30m + 1h 45m).
Hours Minutes Seconds Calculator
Convert or sum time in H:M:S format (e.g. to decimal hours or add two durations).
Time Calculator
Add or subtract time (hours and minutes) in a simple way.
Inverse Trigonometric Functions (Graphs)
Explore inverse trig functions (arcsin, arccos, arctan): domain, range, and value at a number.
Trigonometric Ratios Calculator
Get sin, cos, and tan for any angle (degrees or radians).
Binary to Octal Converter
Convert binary numbers to octal in your browser. Enter binary digits (0 and 1), get octal result—free and client-side.
Binary to String Converter
Convert binary (0 and 1) to text string in your browser. Paste binary or type, get readable text—free and client-side.
Date to Roman Numerals
Convert a year or date to Roman numerals (e.g. 2024 → MMXXIV). Free and client-side in your browser.
Hex to Octal Converter
Convert hexadecimal numbers to octal in your browser. Enter hex (0-9, A-F), get octal result—free and client-side.
Octal to Binary Converter
Convert octal numbers to binary in your browser. Enter octal digits (0-7), get binary (0 and 1)—free and client-side.
Octal to Hex Converter
Convert octal numbers to hexadecimal in your browser. Enter octal (0-7), get hex (0-9, A-F)—free and client-side.
Roman Numerals Converter
Convert between Roman numerals and numbers (1–3999) in your browser. Enter Roman (e.g. MMXXIV) or a number—free and client-side.
String to Binary Converter
Convert text to binary (0 and 1) in your browser. Type or paste text, get binary representation—free and client-side.
Roman Numerals Date Converter
Convert Roman numeral years to numbers (e.g. MMXXIV → 2024). Enter Roman numerals, get the year—free and client-side.
Acres to Square Feet Converter
Convert between acres and square feet. 1 acre = 43,560 sq ft. Bidirectional converter. Client-side only.
Angle Converter
Convert between degrees, radians, and gradians. Enter an angle in one unit and see the equivalent in the others. Client-side only.
Celsius to Kelvin Converter
Convert between Celsius and Kelvin. K = °C + 273.15. Bidirectional, client-side only.
Computer Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB. Use binary (1024) or decimal (1000) units. Client-side only.
Decimal Degrees to Degrees Minutes Seconds
Convert between decimal degrees and DMS (degrees °, minutes ', seconds "). Used for coordinates. Client-side only.
Cooking Calculator
Convert between cooking volumes: cups, tablespoons, teaspoons, fluid ounces, and milliliters. Client-side only.
Digits to Words Converter
Convert numbers to words in English. Type a number and get its spelling (e.g. 1 → one, 42 → forty-two). Client-side only.
Distance Calculator
Convert between meters, kilometers, miles, feet, yards, and inches. Common length and distance units. Client-side only.
Energy Calculator
Convert between joules (J), kilowatt-hours (kWh), calories (cal), and BTU. Common energy units. Client-side only.
Fahrenheit to Kelvin Converter
Convert between Fahrenheit and Kelvin. K = (°F − 32) × 5/9 + 273.15. Bidirectional, client-side only.
Height CM to Feet and Inches
Convert height from centimeters to feet and inches (e.g. 170 cm = 5 ft 7 in). Client-side only.
Height Feet and Inches to CM
Convert height from feet and inches to centimeters. Enter ft and in, get cm. Client-side only.
Height Ft Cm Converter
Convert height between feet+inches and centimeters. Combined bidirectional converter. Client-side only.
Hours to Minutes Converter
Convert hours to minutes. Enter hours (decimal or whole), get minutes. Client-side only.
Kelvin to Celsius Converter
Convert between Kelvin and Celsius. °C = K − 273.15. Bidirectional, client-side only.
Kelvin to Fahrenheit Converter
Convert between Kelvin and Fahrenheit. °F = (K − 273.15) × 9/5 + 32. Bidirectional, client-side only.
Metric Units Converter
Convert common metric prefixes and units: length (m, km, mm), mass (g, kg), and prefixes (kilo, milli, etc.). Client-side only.
Minutes to Hours Converter
Convert minutes to hours. Enter minutes, get hours (decimal). Client-side only.
Numbers to Words
Convert a number to English words (e.g. 1234 → one thousand two hundred thirty-four). Client-side only.
Power Unit Converter
Convert between power units: watts (W), kilowatts (kW), horsepower (hp), and more. Client-side only.
Square Feet to Acres Converter
Convert between square feet and acres. 1 acre = 43,560 sq ft. Bidirectional, client-side only.
Square Feet to Square Meters Converter
Convert between square feet and square meters. 1 sq ft ≈ 0.092903 sq m. Bidirectional, client-side only.
Square Meters to Square Feet Converter
Convert between square meters and square feet. 1 sq m ≈ 10.764 sq ft. Bidirectional, client-side only.
Time Calculator
Add or subtract time (hours, minutes, seconds) and convert between time formats. Client-side only.
Custom Unit Converter
Generic two-unit converter: enter a factor and optional offset (result = value × factor + offset). Client-side only.
RGB to Grayscale Converter
Convert RGB values to grayscale using standard luminance formula (no image upload). Client-side only.
CM to KM Converter
Convert centimeters to kilometers. 1 km = 100,000 cm. Client-side only.
CM to Meter Converter
Convert centimeters to meters. 1 m = 100 cm. Client-side only.
CM to Mile Converter
Convert centimeters to miles. 1 mile ≈ 160,934.4 cm. Client-side only.
CM to MM Converter
Convert centimeters to millimeters. 1 cm = 10 mm. Client-side only.
CM to Yard Converter
Convert centimeters to yards. 1 yard = 91.44 cm. Client-side only.
Feet and Inches to CM
Convert height or length from feet and inches to centimeters. Enter ft and in, get cm. Client-side only.
Feet and Inches to Feet
Convert feet and inches to decimal feet. Enter ft and in, get total feet (e.g. 5 ft 6 in = 5.5 ft). Client-side only.
Feet and Inches to Inches
Convert feet and inches to total inches. Enter ft and in, get total inches (e.g. 5 ft 7 in = 67 in). Client-side only.
Feet and Inches to Meter
Convert feet and inches to meters. Enter ft and in, get meters. 1 in = 0.0254 m. Client-side only.
Feet and Inches to MM
Convert feet and inches to millimeters. Enter ft and in, get mm. 1 in = 25.4 mm. Client-side only.
Feet to Feet and Inches
Convert decimal feet to feet and inches (e.g. 5.5 ft → 5 ft 6 in). Client-side only.
Feet to Inch Converter
Convert feet to inches. 1 ft = 12 in. Client-side only.
Feet to Mile Converter
Convert feet to miles. 1 mi = 5280 ft. Client-side only.
Feet to MM Converter
Convert feet to millimeters. 1 ft = 304.8 mm. Client-side only.
Feet to Yard Converter
Convert feet to yards. 1 yd = 3 ft. Client-side only.
Inch to CM Converter
Convert inches to centimeters. 1 in = 2.54 cm. Client-side only.
Inch to Feet Converter
Convert inches to feet. 1 ft = 12 in. Client-side only.
Inch to Feet and Inches
Convert inches to feet and inches (e.g. 18 in → 1 ft 6 in). Client-side only.
Inch to KM Converter
Convert inches to kilometers. 1 in = 0.0254 m, 1 km = 1000 m. Client-side only.
Inch to Meter Converter
Convert inches to meters. 1 in = 0.0254 m. Client-side only.
Inch to Mile Converter
Convert inches to miles. 1 mi = 5280 ft = 63360 in. Client-side only.
Inch to MM Converter
Convert inches to millimeters. 1 in = 25.4 mm. Client-side only.
Inch to Yard Converter
Convert inches to yards. 1 yd = 36 in. Client-side only.
KM to CM Converter
Convert kilometers to centimeters. 1 km = 1000 m, 1 m = 100 cm. Client-side only.
KM to Inch Converter
Convert kilometers to inches. 1 km = 1000 m, 1 m ≈ 39.37 in. Client-side only.
KM to Meter Converter
Convert kilometers to meters. 1 km = 1000 m. Client-side only.
KM to MM Converter
Convert kilometers to millimeters. 1 km = 1000 m, 1 m = 1000 mm. Client-side only.
KM to Yard Converter
Convert kilometers to yards. 1 km = 1000 m, 1 yd = 0.9144 m. Client-side only.
Meter to CM Converter
Convert meters to centimeters. 1 m = 100 cm. Client-side only.
Meter to Feet Converter
Convert meters to feet. 1 ft = 0.3048 m. Client-side only.
Meter to Feet and Inches
Convert meters to feet and inches (e.g. 1 m → 3 ft 3.37 in). Client-side only.
Meter to Inch Converter
Convert meters to inches. 1 in = 0.0254 m. Client-side only.
Meter to KM Converter
Convert meters to kilometers. 1 km = 1000 m. Client-side only.
Meter to Mile Converter
Convert meters to miles. 1 mi = 1609.344 m. Client-side only.
Meter to MM Converter
Convert meters to millimeters. 1 m = 1000 mm. Client-side only.
Meter to Yard Converter
Convert meters to yards. 1 yd = 0.9144 m. Client-side only.
Mile to CM Converter
Convert miles to centimeters. 1 mi = 160,934.4 cm. Client-side only.
Mile to Feet Converter
Convert miles to feet. 1 mi = 5,280 ft. Client-side only.
Mile to Inch Converter
Convert miles to inches. 1 mi = 63,360 in. Client-side only.
Mile to Meter Converter
Convert miles to meters. 1 mi = 1,609.344 m. Client-side only.
Mile to MM Converter
Convert miles to millimeters. 1 mi = 1,609,344 mm. Client-side only.
Mile to Yard Converter
Convert miles to yards. 1 mi = 1,760 yd. Client-side only.
MM to CM Converter
Convert millimeters to centimeters. 10 mm = 1 cm. Client-side only.
MM to Feet Converter
Convert millimeters to feet. 304.8 mm = 1 ft. Client-side only.
MM to Feet and Inches
Convert millimeters to feet and inches (X ft Y in). 304.8 mm = 1 ft, 12 in = 1 ft. Client-side only.
MM to Inch Converter
Convert millimeters to inches. 25.4 mm = 1 in. Client-side only.
MM to KM Converter
Convert millimeters to kilometers. 1,000,000 mm = 1 km. Client-side only.
MM to Meter Converter
Convert millimeters to meters. 1000 mm = 1 m. Client-side only.
MM to Mile Converter
Convert millimeters to miles. 1,609,344 mm = 1 mi. Client-side only.
MM to Yard Converter
Convert millimeters to yards. 914.4 mm = 1 yd. Client-side only.
Yard to CM Converter
Convert yards to centimeters. 1 yd = 91.44 cm. Client-side only.
Yard to Feet Converter
Convert yards to feet. 1 yd = 3 ft. Client-side only.
Yard to Inch Converter
Convert yards to inches. 1 yd = 36 in. Client-side only.
Yard to KM Converter
Convert yards to kilometers. 1 yd = 0.0009144 km. Client-side only.
Yard to Meter Converter
Convert yards to meters. 1 yd = 0.9144 m. Client-side only.
Yard to Mile Converter
Convert yards to miles. 1,760 yd = 1 mi. Client-side only.
Yard to MM Converter
Convert yards to millimeters. 1 yd = 914.4 mm. Client-side only.
Number Base Converter
Convert numbers between bases: binary (2), octal (8), decimal (10), and hexadecimal (16). Client-side only.
Decimal to Other Base Converter
Convert decimal numbers to or from binary, octal, and hexadecimal. Client-side only.
Hex to Other Base Converter
Convert hexadecimal numbers to or from binary, octal, and decimal. Client-side only.
PPM to Percent Converter
Convert between parts per million (ppm) and percent. 1% = 10,000 ppm. Client-side only.
Percent to Decimal and Fraction Converter
Convert percent to decimal or fraction and vice versa. Client-side only.
ASCII Hex Binary Decimal Converter
Convert between ASCII characters and their numeric codes in hex, binary, and decimal. Character ↔ code conversion.
Base Converter (2–36)
Convert numbers between any bases from 2 to 36. Generic radix conversion for binary, decimal, hex, and more.
Binary Converter (Binary ↔ Decimal, Hex)
Convert between binary, decimal, and hexadecimal. Binary to decimal, binary to hex, and vice versa.
Degrees Minutes Seconds to Decimal Degrees
Convert coordinates from DMS (degrees °, minutes ', seconds ") to decimal degrees. Useful for GPS and mapping.
Decimal Degrees to Degrees Minutes Seconds
Convert decimal degrees to DMS (degrees °, minutes ', seconds "). Useful for GPS and mapping coordinates.
Hex Decimal Binary Converter
Convert between hexadecimal, decimal, and binary numbers. All three formats in one tool.
PPM to PPT Converter (Parts Per Million to Parts Per Trillion)
Convert between parts per million (ppm) and parts per trillion (ppt). 1 ppm = 1,000,000 ppt.
Gram to Kg Converter
Convert grams to kilograms. 1 kg = 1000 g. Simple mass conversion.
Gram to Mg Converter
Convert grams to milligrams. 1 g = 1000 mg. Simple mass conversion.
Gram to Ounce Converter
Convert grams to ounces (avoirdupois). 1 oz ≈ 28.35 g. Mass conversion.
Gram to Pound Converter
Convert grams to pounds (avoirdupois). 1 lb ≈ 453.6 g. Mass conversion.
Kg to Gram Converter
Convert kilograms to grams. 1 kg = 1000 g. Simple mass conversion.
Kg to Mg Converter
Convert kilograms to milligrams. 1 kg = 1,000,000 mg. Mass conversion.
Kg to Ounce Converter
Convert kilograms to ounces (avoirdupois). 1 kg ≈ 35.27 oz (1 oz ≈ 28.35 g). Mass conversion.
Kg to Pound Converter
Convert kilograms to pounds (avoirdupois). 1 kg ≈ 2.205 lb (1 lb ≈ 453.6 g). Mass conversion.
Kg to Ton Converter
Convert kilograms to metric tons. 1 ton = 1000 kg. Mass conversion.
Mcg to Mg Converter (Micrograms to Milligrams)
Convert micrograms (mcg or μg) to milligrams (mg). 1 mg = 1000 mcg. Mass conversion.
Mg to Gram Converter
Convert milligrams to grams. 1 g = 1000 mg. Simple mass conversion.
Mg to Kg Converter
Convert milligrams to kilograms. 1 kg = 1,000,000 mg. Mass conversion.
Mg to Mcg Converter (Milligrams to Micrograms)
Convert milligrams (mg) to micrograms (mcg or μg). 1 mg = 1000 mcg. Mass conversion.
Ounce to Gram Converter
Convert ounces (avoirdupois) to grams. 1 oz ≈ 28.35 g. Mass conversion.
Ounce to Kg Converter
Convert ounces (avoirdupois) to kilograms. 1 oz ≈ 0.02835 kg. Mass conversion.
Ounce to Pound Converter
Convert ounces to pounds (avoirdupois). 1 lb = 16 oz. Mass conversion.
Pound and Ounce to Kg Converter
Convert pounds and ounces to kilograms. Enter lb + oz to get kg. 1 lb = 16 oz, 1 lb ≈ 0.4536 kg.
Pound to Gram Converter
Convert pounds (avoirdupois) to grams. 1 lb ≈ 453.6 g. Mass conversion.
Pound to Kg Converter
Convert pounds (avoirdupois) to kilograms. 1 lb ≈ 0.4536 kg. Mass conversion.
Pound to Ounce Converter
Convert pounds to ounces (avoirdupois). 1 lb = 16 oz. Mass conversion.
Pound to Stone Converter
Convert pounds to stone (UK). 1 stone = 14 lb. Mass conversion.
Pound to Ton Converter
Convert pounds to US short tons. 1 short ton = 2000 lb. Mass conversion.
Stone to Pound Converter
Convert stone (UK) to pounds. 1 stone = 14 lb. Mass conversion.
Ton to Kg Converter
Convert US short tons to kilograms. 1 short ton ≈ 907.185 kg. Mass conversion.
Ton to Pound Converter
Convert US short tons to pounds. 1 short ton = 2000 lb. Mass conversion.