Decimal System Prefixes
Prefix names used for multiples and submultiples units.
Decimal multiples of units:
Prefix | Measure | Decimal equivalent | Exponential expression |
---|---|---|---|
y - yocto | 0.000 000 000 000 000 000 000 001 | E^{-24} | |
z - zepto | 0.000 000 000 000 000 000 001 | E^{-21} | |
a - atto | one-quintillionth | 0.000 000 000 000 000 001 | E^{-18} |
f - femto | one-quadrillionth | 0.000 000 000 000 001 | E^{-15} |
p - pico | one-trillionth | 0.000 000 000 001 | E^{-12} |
n - nano | one-billionth | 0.000 000 001 | E^{-9} |
μ - micro | one-millionth | 0.000 001 | E^{-6} |
m - milli | one-thousandth | 0.001 | E^{-3} |
c - centi | one-hundredth | 0.01 | E^{-2} |
d - deci | one-tenth | 0.1 | E^{-1} |
Uni | one | 1 | E^{0} |
d - deka | ten | 10 | E^{1} |
h - hecto | one hundred | 100 | E^{2} |
k - kilo | one thousand | 1 000 | E^{3} |
M - mega | one million | 1 000 000 | E^{6} |
G - giga | one billion | 1 000 000 000 | E^{9} |
T - tera | one trillion | 1 000 000 000 000 | E^{12} |
P - peta | 1 000 000 000 000 000 | E^{15} | |
E - exa | 1 000 000 000 000 000 000 | E^{18} | |
Z - zetta | 1 000 000 000 000 000 000 000 | E^{21} | |
Y - yotta | 1 000 000 000 000 000 000 000 000 | E^{24} |
Prefixes used in the SI system.