| Purpose | Name | Symbol | Factor | Common name | Purpose | Name | Symbol | Factor | Common name |
|---|---|---|---|---|---|---|---|---|---|
| larger quantities or whole units |
quetta | Q | 1030 | nonillion | smaller quantities or sub units |
deci decimeter |
d | 10-1 | tenth |
| ronna | R | 1027 | octillion | centi centigram |
c | 10-2 | hundredth | ||
| yotta | Y | 1024 | septillion | milli milliliter |
m | 10-3 | thousandth | ||
| zetta | Z | 1021 | sextillion | micro microgram |
μ | 10-6 | millionth | ||
| exa | E | 1018 | quintillion | nano nanometer |
n | 10-9 | billionth | ||
| peta | P | 1015 | quadrillion | pico picogram |
p | 10-12 | trillionth | ||
| tera terahertz |
T | 1012 | trillion | femto femtosecond |
f | 10-15 | quadrillionth | ||
| giga gigawatt |
G | 109 | billion | atto | a | 10-18 | quintillionth | ||
| mega | M | 106 | million | zepto zeptosecond |
z | 10-21 | sextillionth | ||
| kilo kiloliter |
k | 103 | thousand | yocto yoctosecond |
y | 10-24 | septillionth | ||
| hecto hectare |
h | 102 | hundred | ronto | r | 10-27 | octillionth | ||
| deka dekameter |
da | 101 | ten | quecto | q | 10-30 | nonillionth | ||
| 100 | one |
Source: Metric (SI) Prefixes