An SI prefix represents decimal multiples and sub-multiples of an SI unit.[1] SI prefixes are determined by the CGPM. They are designed to be used with SI units, for example, kilometer, milligram and nanosecond. However, in practice, they can also be applied to non-SI units, such as megapixel and gigabyte. SI stands for "Système international", French for "international system".[2]
On November 18, 2022, the prefixes of 1027 and 1030 were officially adopted as "ronna-", and "quetta-" respectively in a CGPM resolution.[3]
The SI prefixes are given below.[4]
| Name | Value | Factor/Divider | Name | Value |
|---|---|---|---|---|
| deca- | 10 | ten | deci- | 0.1 |
| hecto- | 100 | hundred | centi- | 0.01 |
| kilo- | 1000 | thousand | milli- | 0.001 |
| mega- | 106 | million | micro- | 10-6 |
| giga- | 109 | billion | nano- | 10-9 |
| tera- | 1012 | trillion | pico- | 10-12 |
| peta- | 1015 | quadrillion | femto- | 10-15 |
| exa- | 1018 | quintillion | atto- | 10-18 |
| zetta- | 1021 | sextillion | zepto- | 10-21 |
| yotta- | 1024 | septillion | yocto- | 10-24 |
| ronna- | 1027 | octillion | ronto- | 10-27 |
| quetta- | 1030 | nonillion | quecto- | 10-30 |
For other prefixes, please see prefix.
Sources[]
- ↑ Bureau International des Poids et Mesures The International System of Units (SI) 9th edition. 2019.
- ↑ LNE, Introduction to the international system of units (SI)
- ↑ Resolution 3 of the 27th CGPM (2022) Retrieved 2023-06-11.
- ↑ Bureau International des Poids et Mesures The International System of Units (SI): Prefixes Retrieved 2023-10-24.
See also[]
Suffixes: -teen · -ty · -plex · -illion · -yllion · -exian · -chime · -toll · -gong · -bong · -throng · -illiob
Prefixes: gar- · fz- · fuga- · megafuga- · booga- · trooga- · googo- · googolple-
SI prefixes: deca- · hecto- · kilo- · mega- · giga- · tera- · peta- · exa- · zetta- · yotta- · ronna- · quetta-
Non-SI prefixes: 1.001 · 1.01 · 1.1 · 1.5 · 2 · 3 · 666 · 104 · 105 · 107 · 108 · 1010 · 1011 · 1013 · 1014 · 1016 · 1017 · 1019 · 1020 · 1022 · 1023 · 1025 · 1027 · 1028 · 1029 · 1030 · 1031 · 1032 · 1033 · 1034 · 1035 · 1036 · 1039 · 1042 · 1045 · 1048 · 1051 · 1054 · 1057 · 1060 · 1063 · 1066 · 1069 · 1072 · 1075 · 1090 · 10100 · 10120 · 10150 · 10180 · 10210 · 10240 · 10270 · 10300 · 10600 · 10900 · 101200 · 101500 · 101800 · 102100 · 102400 · 102700 · 103000 and higher