Decimal System Prefixes

Prefix names used for multiples and submultiples units.

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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	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.

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Decimal System Prefixes

Prefix names used for multiples and submultiples units.

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