Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal instantly.

BinaryBase 2

OctalBase 8

DecimalBase 10

HexadecimalBase 16

Number systems — binary, octal, decimal, hexadecimal

Computers use binary (base 2), but programmers also work with hexadecimal (base 16) for colors and memory addresses, and octal (base 8) for Unix permissions. This tool converts between all four common number systems instantly.