Binary prefixes table
Binary prefixes - kibi, mebi, gibi, tebi etc.

Binary prefixes

NameSymbolFactorDifference to SI analogueSI analogue nameSI analogue symbolSI analogue factor
Ki
1024 = 10241
2.40%
k
1000 = 10001
Mi
1 048 576 = 10242
4.86%
M
1000 000 = 10002
Gi
1 073 741 824 = 10243
7.37%
G
1000 000 000 = 10003
Ti
1 099 511 627 776 = 10244
9.95%
T
1000 000 000 000 = 10004
Pi
1 125 899 906 842 624 = 10245
12.59%
P
1000 000 000 000 000 = 10005
Ei
1 152 921 504 606 846 980 = 10246
15.29%
E
1000 000 000 000 000 000 = 10006
Zi
1 180 591 620 717 411 300 000 = 10247
18.06%
Z
1000 000 000 000 000 000 000 = 10007
Yi
1 208 925 819 614 629 180 000 000 = 10248
20.89%
Y
1000 000 000 000 000 000 000 000 = 10008

Some facts

  • Binary prefixes system is an anolog to metric prefixes (SI), adjusted for the needs of computer science. Binary prefixes differ from related metric prefixes in the following ways:
    • There are no fractional (eg. mili, micro, nano, pico) prefixes, because those have no application in computer science. Smallest piece of information is one bit, which is indivisible.
    • Usage of binary base (number 1024 and its powers), instead of metric one (number 10 and its powers)
  • Despite the existence of binary prefixes, many people still use related SI prefixes, while they're thinking about binary ones. For example someone can say kilo-byte (SI prefix - kilo meaning 1000) bearing in mind 1024 bytes (which is really kebi-byte). Because poeple are rather reluctant to use new prefixes (kebi, mebi etc.), sometimes binary prefixes are called "death law".

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