256 In Hex

256 in hex is 100. Full conversion of 256 (decimal) to binary 100000000, decimal 256 and hex 100.

Binary (base 2): 100000000
Octal (base 8): 400
Decimal (base 10): 256
Hexadecimal (base 16): 100

How this conversion works

256 is 100 in hex: the first value that needs a third hex digit, because a byte tops out at 255. It is the count of distinct values one byte can represent.

Each base just uses a different set of digits for the same quantity. Reading 256 as a decimal number gives the decimal value 256; expressing that same value in base two, eight or sixteen produces the rows above. To convert any number between bases — including custom bases from 2 to 36 — use the number base converter.