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Multiples and Submultiples of the Electrical Units

In this table we show the International System of Units (SI) adopted by the International Committee of Weights and Measures with the prefixes, symbols and values of the multiples and submultiples of the physical quantities related to electrical science and engineering.


Multiple Prefix Symbol Factor Decimal
yotta Y 1024 1 000 000 000 000 000 000 000 000
zetta Z 1021 1 000 000 000 000 000 000 000
exa E 1018 1 000 000 000 000 000 000
peta P 1015 1 000 000 000 000 000
tera T 1012 1 000 000 000 000
giga G 109 1 000 000 000
mega M 106 1 000 000
kilo k 103 1 000
hecto h 102 1 00
deca da 10 1 0
Submultiple Prefix Symbol Factor Decimal
deci d 10-1 0.1
centi c 10-2 0.01
mili m 10-3 0.001
micro micro 10-6 0.000 001
nano n 10-9 0.000 000 001
pico p 10-12 0.000 000 000 001
femto f 10-15 0.000 000 000 000 001
atto a 10-18 0.000 000 000 000 000 001
zepto z 10-21 0.000 000 000 000 000 000 001
yocto y 10-24 0.000 000 000 000 000 000 000 001

 Examples:

100 mF = 100 x 10-3 = 100 x 0.001 = 0,1 farads

100 milifarads = 0,1 farads


2,5 kV = 2.5 x 103 = 2.5 x 1000 = 2.500 volts

2,5 kilovolts = 2.500 volts



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