Number Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16).
All Number Bases
Number Base Systems Explained
Binary (base 2) uses only 0 and 1 — used in computing. Octal (base 8) uses 0–7. Decimal (base 10) is our everyday number system. Hexadecimal (base 16) uses 0–9 and A–F — widely used in programming, HTML colours and memory addresses. Use unitconverttools.com to convert any number instantly.