What conversions are supported?

Binary ↔ decimal and binary ↔ hexadecimal. All client-side.

1010 binary = 10 decimal = A hex.

Values are treated as unsigned integers.

Online Binary Converter (Binary ↔ Decimal, Hex)

Convert between binary, decimal, and hexadecimal. Binary to decimal, binary to hex, and vice versa.

Direction

Binary

What conversions are supported?: Binary ↔ decimal and binary ↔ hexadecimal. All client-side.
Example?: 1010 binary = 10 decimal = A hex.
Negative numbers?: Values are treated as unsigned integers.

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.