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Multiples of bits
SI decimal prefixes IEC binary prefixes
Name
(Symbol)
Standard
SI
Binary
usage
Name
(Symbol)
Value
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

A kibibit (a contraction of kilo binary digit) is a unit of information or computer storage, abbreviated Kibit, or sometimes Kib. (Note that the abbreviation is capitalized, while kbit is not.)

1 kibibit = 210 bits = 1,024 bits
1 kibibit = 27 bytes = 128 bytes

The kibibit is closely related to the kilobit, which can either be a synonym for kibibit, or refer to 103 bits = 1,000 bits, depending on context.

The National Institute of Standards and Technology of U.S.A. notes that "it is important to recognize that the new prefixes for binary multiples are not part of the International System of Units (SI), the modern metric system." It should also be noted that they are not in general use among professional software and electrical engineers, who generally use decimal prefixes when referring to binary quantities.

See also


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