The following prefixes signify orders of magnitude of the units in base 10. Some are fractions of the unit and others are multiples of the units.
| peta | P | 1015 | centi | c | 10-2 | |
| tera | T | 1012 | milli | m | 10-3 | |
| giga | G | 109 | micro | μ | 10-6 | |
| mega | M | 106 | nano | n | 10-9 | |
| kilo | k | 103 | pico | p | 10-12 | |
| deci | d | 10-1 | femto | f | 10-15 | |