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Decimal System Prefixes

Prefix names used for multiples and submultiples units.

Decimal multiples of units:

Decimal System Prefixes
PrefixName of FactorDecimal equivalentExponential
expression
y - yokto  septillionth 0.000 000 000 000 000 000 000 001 E-24
z - zepto  sextillionth 0.000 000 000 000 000 000 001 E-21
a - atto trillionth 0.000 000 000 000 000 001 E-18
f - femto thousand billionth 0.000 000 000 000 001 E-15
p - pico billionth 0.000 000 000 001 E-12
n - nano thousand billionth 0.000 000 001 E-9
μ - micro millionth 0.000 001 E-6
m - milli thousandth 0.001 E-3
c - centi hundredth 0.01 E-2
d - deci tenth 0.1 E-1
Uni one 1 E0
d - deka ten 10 E1
h - hecto one hundred 100 E2
k - kilo one thousand 1 000 E3
M - mega one million 1 000 000 E6
G - giga one billion 1 000 000 000 E9
T - tera one trillion 1 000 000 000 000 E12
P - peta   1 000 000 000 000 000 E15
E - exa   1 000 000 000 000 000 000 E18
Z - zetta   1 000 000 000 000 000 000 000 E21
Y - yotta   1 000 000 000 000 000 000 000 000 E24

Prefixes used in the SI system in according with DIN 1301 "Units - Part 1: Unit names, unit symbols".

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