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The International System of Units specifies twenty SI prefixes:

SI prefixes
m
n
Prefix Symbol 1000 10 Decimal Short scale Long scale Since
8 24
yotta Y 1000 10 1000000000000000000000000 Septillion Quadrillion 1991
7
21
zetta Z 1000 10 1000000000000000000000 Sextillion Trilliard 1991
6
18
exa E 1000 10 1000000000000000000 Quintillion Trillion 1975
15
5
peta P 1000 10 1000000000000000 Quadrillion Billiard 1975
4 12
tera T 1000 10 1000000000000 Trillion Billion 1960
3 9
giga G 1000 10 1000000000 Billion Milliard 1960
2
6
mega M 1000 10 1000000 Million 1960
3
1
kilo k 1000 10 1000 Thousand 1795
2
2/3
hecto h 1000 10 100 Hundred 1795
1/3 1
deca da 1000 10 10 Ten 1795
0 0
1000 10 1 One –
−1
deci d 1000 −1/3 10 0.1 Tenth 1795
−2
centi c 1000 −2/3 10 0.01 Hundredth 1795
−3
−1
milli m 1000 10 0.001 Thousandth 1795
−2 −6
micro μ 1000 10 0.000001 Millionth 1960
−3 −9
nano n 1000 10 0.000000001 Billionth Milliardth 1960
−4
pico p 1000 10 −12 0.000000000001 Trillionth Billionth 1960
−5
femto f 1000 10 −15 0.000000000000001 Quadrillionth Billiardth 1964
−6
atto a 1000 10 −18 0.000000000000000001 Quintillionth Trillionth 1964
−7 −21
zepto z 1000 10 0.000000000000000000001 Sextillionth Trilliardth 1991
−8 −24
yocto y 1000 10 0.000000000000000000000001 Septillionth Quadrillionth 1991

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