SI PrefixesConstants SI Units SI Prefixes Binary Prefixes Symbols Formulae Radioactivity Greek Letters EM Spectrum Laws/Thoeries
List of Prefixes used with SI units. Be aware that computing applications often use multiples of 1024 (210.) A new set of Binary Prefixes, shown on next page, was created to reduce the risk of confusion.
SI Prefix
| Prefix | Symbol | Meaning | |
|---|---|---|---|
| quetta | Q | x 1030 | |
| ronna | R | x 1027 | |
| yotta | Y | x 1024 | |
| zetta | Z | x 1021 | |
| exa | E | x 1018 | |
| peta | P | x 1015 | |
| tera | T | x 1012 | |
| giga | G | x 109 | |
| mega | M | x 106 | |
| myria | my | x 10000 | x 104 |
| kilo | k | x 1000 | x 103 |
| hecto | h | x 100 | x 102 |
| deca | da | x 10 | x 101 |
| 1 | x 100 | ||
| deci | d | x 0.1 | x 10-1 |
| centi | c | x 0.01 | x 10-2 |
| milli | m | x 0.001 | x 10-3 |
| micro | µ | x 10-6 | |
| nano | n | x 10-9 | |
| pico | p | x 10-12 | |
| femto | f | x 10-15 | |
| atto | a | x 10-18 | |
| zepto | z | x 10-21 | |
| yocto | y | x 10-24 | |
| ronto | r | x 10-27 | |
| quecto | q | x 10-30 | |
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