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Multiples of bits
SI decimal prefixes IEC binary prefixes
kilobit (kbit) 103 210 kibibit (Kibit) 210
megabit (Mbit) 106 220 mebibit (Mibit) 220
gigabit (Gbit) 109 230 gibibit (Gibit) 230
terabit (Tbit) 1012 240 tebibit (Tibit) 240
petabit (Pbit) 1015 250 pebibit (Pibit) 250
exabit (Ebit) 1018 260 exbibit (Eibit) 260
zettabit (Zbit) 1021 270 zebibit (Zibit) 270
yottabit (Ybit) 1024 280 yobibit (Yibit) 280
See also: Nibble · Byte · Multiples of bytes
Orders of magnitude of data

Gigabit is a unit of digital information storage, with the symbol Gbit (or Gb).

1 gigabit = 109 = 1,000,000,000 bits (which is equal to 125 decimal megabytes or 122 binary mebibytes, as 8 bits equals one byte)

The gigabit is closely related to the gibibit, which is unambiguously equal to 230 bits = 1,073,741,824 bits.

Note that the difference between a billion bits and a gibibit is greater than 7%. This is sufficient to make it economically compelling to represent certain classes of storage devices in (true) gigabits or gigabytes rather than gibibits/gibibytes. RAM and flash chips are usually required to have a capacity that is a power of two, but other devices like hard disk drives need not.

See also


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