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Unit Prefix
SI Unit Prefixes
Prefix
Symbol
Factor
Decimal
Yocto
Septillionth
y
10
-24
0.000000000000000000000001
Zepto
Sextillionth
z
10
-21
0.000000000000000000001
Atto
Quintillionth
a
10
-18
0.000000000000000001
Femto
Quadrillionth
f
10
-15
0.000000000000001
Pico
Trillionth
p
10
-12
0.000000000001
Nano
Billionth
n
10
-9
0.000000001
Micro
Millionth
µ
10
-6
0.000001
Milli
Thousandth
m
10
-3
0.001
Centi
Hundredth
c
10
-2
0.01
Deci
Tenth
d
10
-1
0.1
One
10
0
1
Deca
Ten
da
10
1
10
Hecto
Hundred
h
10
2
100
Kilo
Thousand
k
10
3
1000
Mega
Million
M
10
6
1000000
Giga
Billion
G
10
9
1000000000
Tera
Trillion
T
10
12
1000000000000
Peta
Quadrillion
P
10
15
1000000000000000
Exa
Quintillion
E
10
18
1000000000000000000
Zetta
Sextillion
Z
10
21
1000000000000000000000
Yotta
Septillion
Y
10
24
1000000000000000000000000
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