This article is about the unit of 1000 bits. For the unit of 1024 bits, see kibibit.
Not to be confused with kilobyte.
Multiple-bit units
v
t
e
Decimal
Value
Metric
1000
kbit
kilobit
10002
Mbit
megabit
10003
Gbit
gigabit
10004
Tbit
terabit
10005
Pbit
petabit
10006
Ebit
exabit
10007
Zbit
zettabit
10008
Ybit
yottabit
10009
Rbit
ronnabit
100010
Qbit
quettabit
Binary
Value
IEC
Memory
1024
Kibit
kibibit
Kbit
Kb
kilobit
10242
Mibit
mebibit
Mbit
Mb
megabit
10243
Gibit
gibibit
Gbit
Gb
gigabit
10244
Tibit
tebibit
—
10245
Pibit
pebibit
—
10246
Eibit
exbibit
—
10247
Zibit
zebibit
—
10248
Yibit
yobibit
—
—
—
Orders of magnitude of data
The kilobit is a multiple of the unit bit for digital information or computer storage. The prefix kilo- (symbol k) is defined in the International System of Units (SI) as a multiplier of 103 (1 thousand),[1] and therefore,
1 kilobit = 103bits = 1000 bits.
The kilobit has the unit symbol kbit or kb.
Using the common byte size of 8 bits, 1 kbit is equal to 125 bytes.
The kilobit is commonly used in the expression of data rates of digital communication circuits as kilobits per second (kbit/s or kb/s), or abbreviated as kbps,[2] as in, for example, a 56 kbps PSTN circuit, or a 512 kbit/s broadband Internet connection.
The unit symbol kb (lowercase 'b') is typographically similar to the international standard unit symbol for the kilobyte, i.e. kB (uppercase 'B'). The International Electrotechnical Commission (IEC) recommends the symbol kbit instead of kb for kilobit. The prefix kilo- is often used in fields of computer science and information technology with a meaning of multiplication by 1024 instead of 1000, contrary to international standards, in conjunction with the base unit byte and bit, in which case it is to be written as Ki-, with a capital letter K,[3] e.g., 1 Kibit = 1024 bits. The decimal SI definition, 1 kbit/s = 1000 bit/s, is used uniformly in the context of telecommunication transmission speeds.
The kilobit is closely related to the kibibit, a unit multiple derived from the binary prefix kibi- (symbol Ki) of the same order of magnitude,[3] which is equal to 210bits = 1024 bits, or approximately 2% larger than the kilobit. Despite the definitions of these new prefixes, meant for binary-based quantities of storage by international standards organizations, memory semiconductor chips are still marketed using the metric prefix names to designate binary multiples.
^"Definitions of the SI units: The twenty SI prefixes". physics.nist.gov.
^"Services Update". webservices.ieee.org. Archived from the original on 2020-09-04. Retrieved 2019-08-05.
^ ab"Definitions of the SI units: The binary prefixes". physics.nist.gov.
The kilobit is a multiple of the unit bit for digital information or computer storage. The prefix kilo- (symbol k) is defined in the International System...
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