11111111 In Decimal

11111111 in decimal is 255. Full conversion of 11111111 (binary) to binary 11111111, decimal 255 and hex FF.

Binary (base 2): 11111111
Octal (base 8): 377
Decimal (base 10): 255
Hexadecimal (base 16): FF

How this conversion works

Eight ones in binary sum to 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255. It is the "all bits on" byte, the binary twin of hex FF.

Each base just uses a different set of digits for the same quantity. Reading 11111111 as a binary number gives the decimal value 255; 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.