Online Math Calculators Index
Overview of free online math calculators: basic arithmetic, fractions, percentages, roots, logarithms, trigonometry, and more.
Math calculator links
- Simple 4-function calculator
- Basic + − × ÷ calculator
- Add numbers
- Subtraction a − b
- Multiply numbers
- Division a ÷ b
- Remainder (mod)
- Fraction simplifier
- Percentage change
- Percentage increase
- Nth root
- Natural log ln(x)
- Convert between bases (2, 8, 10, 16)
- Binary arithmetic
- Hex arithmetic
- Hex add/subtract and hex ↔ decimal
- Octal arithmetic
- Trigonometry (sin, cos, tan)
- Complex number calculator
- Exponential growth P(t) = P₀e^(rt)
- Convolution of two sequences
- Add/subtract integers
Frequently Asked Questions
- What math calculators are available?
- Basic (add, subtract, multiply, divide), fractions, percentages, roots, natural log, base conversion, binary/hex/octal, trigonometry, complex numbers, and more.
- Are these calculators free?
- Yes. All tools are free with no signup.
- Can I use them on mobile?
- Yes. The site is responsive and works on phones and tablets.
Related Calculators
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.