Number Base Converter

Convert between Decimal, Binary, Hexadecimal and Octal in real-time. Type in any field — all others update instantly.

Decimal (Base 10) 0–9

Binary (Base 2) 0,1

Hexadecimal (Base 16) 0–F

Octal (Base 8) 0–7

Quick values:

Decimal → Binary

Repeatedly divide by 2, collect remainders bottom-up. E.g. 10 = 1010â‚‚

Binary → Hex

Group bits in sets of 4 from right, convert each group. 1111 = F

Decimal → Octal

Repeatedly divide by 8, collect remainders bottom-up. E.g. 255 = 377₈

Hex → Binary

Each hex digit = 4 binary bits. F = 1111, A = 1010, 0 = 0000