SI Number Prefixes Chart
The following table shows the number prefixes as defined by the International System of Units (SI Units) used in science, engineering, finance etc.
| Prefix | Symbol | 10n | Decimal | Short scale | Long scale | ||
|---|---|---|---|---|---|---|---|
| yotta | Y | 1024 | 1 000 000 000 000 000 000 000 000 | Septillion | Quadrillion | ||
| zetta | Z | 1021 | 1 000 000 000 000 000 000 000 | Sextillion | Trilliard | ||
| exa | E | 1018 | 1 000 000 000 000 000 000 | Quintillion | Trillion | ||
| peta | P | 1015 | 1 000 000 000 000 000 | Quadrillion | Billiard | ||
| tera | T | 1012 | 1 000 000 000 000 | Trillion | Billion | ||
| giga | G | 109 | 1 000 000 000 | Billion | Milliard | ||
| mega | M | 106 | 1 000 000 | Million | |||
| kilo | k | 103 | 1 000 | Thousand | |||
| hecto | h | 102 | 100 | Hundred | |||
| deca | da | 101 | 10 | Ten | |||
| 100 | 1 | One | |||||
| deci | d | 10−1 | 0.1 | Tenth | |||
| centi | c | 10−2 | 0.01 | Hundredth | |||
| milli | m | 10−3 | 0.001 | Thousandth | |||
| micro | μ | 10−6 | 0.000 001 | Millionth | |||
| nano | n | 10−9 | 0.000 000 001 | Billionth | Milliardth | ||
| pico | p | 10−12 | 0.000 000 000 001 | Trillionth | Billionth | ||
| femto | f | 10−15 | 0.000 000 000 000 001 | Quadrillionth | Billiardth | ||
| atto | a | 10−18 | 0.000 000 000 000 000 001 | Quintillionth | Trillionth | ||
| zepto | z | 10−21 | 0.000 000 000 000 000 000 001 | Sextillionth | Trilliardth | ||
| yocto | y | 10−24 | 0.000 000 000 000 000 000 000 001 | Septillionth | Quadrillionth | ||