The metric (SI) prefixes scale units by powers of ten — kilo (×1,000), mega (×1,000,000), milli (÷1,000) and so on. This chart lists every standard prefix from yotta to yocto with its symbol and factor.
| Prefix | Symbol | Factor | Value |
|---|---|---|---|
| yotta | Y | 10²⁴ | 1 000 000 000 000 000 000 000 000 |
| zetta | Z | 10²¹ | |
| exa | E | 10¹⁸ | |
| peta | P | 10¹⁵ | |
| tera | T | 10¹² | 1 000 000 000 000 |
| giga | G | 10⁹ | 1 000 000 000 |
| mega | M | 10⁶ | 1 000 000 |
| kilo | k | 10³ | 1 000 |
| hecto | h | 10² | 100 |
| deca | da | 10¹ | 10 |
| deci | d | 10⁻¹ | 0.1 |
| centi | c | 10⁻² | 0.01 |
| milli | m | 10⁻³ | 0.001 |
| micro | µ | 10⁻⁶ | 0.000001 |
| nano | n | 10⁻⁹ | |
| pico | p | 10⁻¹² | |
| femto | f | 10⁻¹⁵ | |
| atto | a | 10⁻¹⁸ | |
| zepto | z | 10⁻²¹ | |
| yocto | y | 10⁻²⁴ |