List of Prefixes for Basic Metric Units

Related article: metric system metric system,
system of weights and measures planned in France and adopted there in 1799; it has since been adopted by most of the technologically developed countries of the world.
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Prefixes for Basic Metric Units

Multiples
Prefix Abbreviation Power of 10 Equivalent
deka- or deca- da 101 ten
hecto- h 102 hundred
kilo- k 103 thousand
mega- M 106 million
giga- G 109 billion
tera- T 1012 trillion
peta- P 1015 quadrillion
exa- E 1018 quintillion
zetta- Z 1021 sextillion
yotta- Y 1024 septillion

Fractions
Prefix Abbreviation Power of 10 Equivalent
deci- d 10−1 tenth
centi- c 10−2 hundredth
milli- m 10−3 thousandth
micro- μ 10−6 millionth
nano- n 10−9 billionth
pico- p 10−12 trillionth
femto- f 10−15 quadrillionth
atto- a 10−18 quintillionth
zepto- z 10−21 sextillionth
yocto- y 10−24 septillionth
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