Number Base Converter

How it works

Every number system is just a different way of counting with a different set of digits. Decimal uses ten digits (0–9), hexadecimal adds the letters A–F to reach sixteen, octal counts to eight, and binary — the language of computers — uses only 0 and 1. When you type into any field, the converter first reads your value as an ordinary integer in that base, then re-expresses the same integer in the other three bases, so all four fields always describe the same number. Digits that don't belong to a base are rejected — for example, "2" is illegal in binary and "9" is illegal in octal — which is why programmers double-check values when reading memory addresses, color codes, or file permissions.