International System of Units (SI) Prefixes

Standard Usage

Prefix Base 10 Decimal Short Scale Long Scale
yotta Y 1024 1 000 000 000 000 000 000 000 000 septillion quadrillion
zetta Z 1021 1 000 000 000 000 000 000 000 sextillion trilliard
exa E 1018 1 000 000 000 000 000 000 quintillion trillion
peta P 1015 1 000 000 000 000 000 quadrillion billiard
tera T 1012 1 000 000 000 000 trillion billion
giga G 109 1 000 000 000 billion milliard
mega M 106 1 000 000 million
kilo k 103 1 000 thousand
hecto h 102 100 hundred
deca da 101 10 ten
100 1 one
deci d 10−1 0.1 tenth
centi c 10−2 0.01 hundredth
milli m 10−3 0.001 thousandth
micro μ 10−6 0.000 001 millionth
nano n 10−9 0.000 000 001 billionth milliardth
pico p 10−12 0.000 000 000 001 trillionth billionth
femto f 10−15 0.000 000 000 000 001 quadrillionth billiardth
atto a 10−18 0.000 000 000 000 000 001 quintillionth trillionth
zepto z 10−21 0.000 000 000 000 000 000 001 sextillionth trilliardth
yocto y 10−24 0.000 000 000 000 000 000 000 001 septillionth quadrillionth

Computer Usage

Prefix Base 2 Decimal Short Scale Long Scale
peta P 250 1 125 899 906 842 624 quadrillion billiard
tera T 240 1 099 511 627 776 trillion billion
giga G 230 1 073 741 824 billion milliard
mega M 220 1 048 576 million
kilo k 210 1024 thousand

 

Leave a Reply