Decimal System Prefixes
Decimal multiples of units:
Prefix | Name of Factor | Decimal equivalent | Exponential 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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