Metric prefixes

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These are the commonly used metric multiplier prefixes…


Unit
Abbreviation
Factor (power of ten)
Factor (number)
Quetto
q
1.E-30
0.000000000000000000000000000001
Ronno
r
1.E-27
0.000000000000000000000000001
Yotto
y
1.E-24
0.000000000000000000000001
Zepto
z
1.E-21
0.000000000000000000001
Atto
a
1.E-18
0.000000000000000001
Femto
f
1.E-15
0.000000000000001
Pico
p
1.E-12
0.000000000001
Nano
n
1.E-09
0.000000001
Micro
µ
1.E-06
0.000001
Milli
m
1.E-03
0.001
Centi
c
1.E-02
0.01
Deci
d
1.E-01
0.1
 
(none)
 0
1
Deca
da
1.E+01
10
Hecto
h
1.E+02
100
Kilo
k
1.E+03
1,000
Myria
(rare)
1.E+04
10,000
Mega
M
1.E+06
1,000,000
Giga
G
1.E+09
1,000,000,000
Tera
T
1.E+12
1,000,000,000,000
Peta
P
1.E+15
1,000,000,000,000,000
Exa
E
1.E+18
1,000,000,000,000,000,000
Zetta
Z
1.E+21
1,000,000,000,000,000,000,000
Yotta
Y
1.E+24
1,000,000,000,000,000,000,000,000
Ronna
R
1.E+27
1,000,000,000,000,000,000,000,000,000
Quetta
Q
1.E+30
1,000,000,000,000,000,000,000,000,000,000

Updated 2022-11-29 to take into account the new metric prefixes agreed at General Conference on Weights and Measures (CGPM) 2022. More onfo.


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