SI prefixes

The 20 SI prefixes are pre-symbols, used to form decimal multiples and submultiples of SI units. For example kilometre (km), kilo means a thousand times. Another example is millimetre (mm), where milli means thousandth part of something.

Contents: SI prefix calculator and SI prefix table.

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SI prefix conversion calculator:

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SI prefix table

SI prefix tables contains 10+10 SI prefixes. First table contains multiple prefixes (they are bigger than base unit) and submultiple prefixes (smaller than base unit). You can find examples below tables:

Multiple prefixes:

Name  Symbol Factor
yotta Y 1024
zetta Z 1021
exa E 1018
peta P 1015
tera T 1012
giga G 109
mega M 106
kilo k 103
hecto h 102
deka da 101
(base) - 100=1

 

Examples:

Submultiple prefixes:

Name  Symbol Factor
(base) - 100=1
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

 

Examples:

Notice:


Source: NIST.gov - prefixes. (retrieved 2017-04-18)

 

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