Binary prefixes#
| Name | Symbol | Factor | Difference to SI analogue | SI analogue name | SI analogue symbol | SI analogue factor |
| kebi | Ki | 1024 = 10241 | 2.40% | kilo | k | 1000 = 10001 |
| mebi | Mi | 1 048 576 = 10242 | 4.86% | mega | M | 1000 000 = 10002 |
| gibi | Gi | 1 073 741 824 = 10243 | 7.37% | giga | G | 1000 000 000 = 10003 |
| tebi | Ti | 1 099 511 627 776 = 10244 | 9.95% | tera | T | 1000 000 000 000 = 10004 |
| pebi | Pi | 1 125 899 906 842 624 = 10245 | 12.59% | peta | P | 1000 000 000 000 000 = 10005 |
| exbi | Ei | 1 152 921 504 606 846 980 = 10246 | 15.29% | exa | E | 1000 000 000 000 000 000 = 10006 |
| zebi | Zi | 1 180 591 620 717 411 300 000 = 10247 | 18.06% | zetta | Z | 1000 000 000 000 000 000 000 = 10007 |
| yobi | Yi | 1 208 925 819 614 629 180 000 000 = 10248 | 20.89% | yotta | 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)
- 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.
- 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 people are rather reluctant to use new prefixes (kebi, mebi etc.), sometimes binary prefixes are called "death law".
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