The SI prefixes and multiplication factors.
Prefix | Symbol | Multiplication factor | Common name (US) |
yotta | Y | 1 000 000 000 000 000 000 000 000 = 1024 | one septillion |
zetta | Z | 1 000 000 000 000 000 000 000 = 1021 | one sextillion |
exa | E | 1 000 000 000 000 000 000 = 1018 | one quintillion |
peta | P | 1 000 000 000 000 000 = 1015 | one quadrillion |
tera | T | 1 000 000 000 000 = 1012 | one trillion |
giga | G | 1 000 000 000 = 109 | one billion |
mega | M | 1 000 000 = 106 | one million |
kilo | k | 1000 = 103 | one thousand |
hecto | h | 100 = 102 | one hundred |
deca | da | 10 = 101 | one ten |
100 = 1 | one | ||
deci | d | 0.1 = 10−1 | one tenth |
centi | c | 0.01 = 10−2 | one hundredth |
milli | m | 0.001 = 10−3 | one thousandth |
micro | μ | 0.000 001 = 10−6 | one millionth |
nano | n | 0.000 000 001 = 10−9 | one billionth |
pico | p | 0.000 000 000 001 = 10−12 | one trillionth |
femto | f | 0.000 000 000 000001 = 10−15 | one quadrillionth |
atto | a | 0.000 000 000 000 000 001 = 10−18 | one quintillionth |
zepto | z | 0.000 000 000 000 000 000 001 = 10−21 | one sextillionth |
yocto | y | 0.000 000 000 000 000 000 000 001 = 10−24 | one septillionth |