Engineering Reference Tables / SI Prefixes or Standard Prefixes

Metric Prefixes are used to describe quantities in terms of a multiple or submultiple of the unit in International System of Units (SI).

Name Symbol Factor / Base 10
yotta Y 10 24
zetta Z 10 21
exa E 10 18
peta P 10 15
tera T 10 12
giga G 10 9
mega M 10 6
kilo k 10 3
hecto h 10 2
deca da 10 1
- - 10 0
deci d 10 −1
centi c 10 −2
milli m 10 −3
micro μ 10 −6
nano n 10 −9
pico p 10 −12
femto f 10 −15
atto a 10 −18
zepto z 10 −21
yocto y 10 −24

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