01 Binary Converter
Convert between binary, decimal, hex and octal
About this calculator
Convert between binary, decimal, octal, and hexadecimal in either direction. Type a number in one base and the calculator shows its equivalents in all the others, with the step-by-step positional breakdown so you can follow the math. Great for students learning number systems, programmers debugging bit values, or anyone curious about how computers count. It also validates your input, flagging impossible digits like a 2 in a binary number instead of producing nonsense.
Tip: each hexadecimal digit maps to exactly four binary digits — that's why programmers prefer hex when reading raw binary.