List of Prefixes for Basic Metric Units
Related article: metric system metric system,
system of weights and measures planned in France and adopted there in 1799; it has since been adopted by most of the technologically developed countries of the world.
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Multiples | |||
| Prefix | Abbreviation | Power of 10 | Equivalent |
| deka- or deca- | da | 101 | ten |
| hecto- | h | 102 | hundred |
| kilo- | k | 103 | thousand |
| mega- | M | 106 | million |
| giga- | G | 109 | billion |
| tera- | T | 1012 | trillion |
| peta- | P | 1015 | quadrillion |
| exa- | E | 1018 | quintillion |
| zetta- | Z | 1021 | sextillion |
| yotta- | Y | 1024 | septillion |
Fractions | |||
| Prefix | Abbreviation | Power of 10 | Equivalent |
| deci- | d | 10−1 | tenth |
| centi- | c | 10−2 | hundredth |
| milli- | m | 10−3 | thousandth |
| micro- | μ | 10−6 | millionth |
| nano- | n | 10−9 | billionth |
| pico- | p | 10−12 | trillionth |
| femto- | f | 10−15 | quadrillionth |
| atto- | a | 10−18 | quintillionth |
| zepto- | z | 10−21 | sextillionth |
| yocto- | y | 10−24 | septillionth |