Prefix
|
Base 1000
|
Base 10
|
Decimal
|
English word
|
Adoption
|
Name
|
Symbol
|
Short scale
|
Long scale
|
yotta
|
Y
|
10008
|
1024
|
1000000000000000000000000
|
septillion
|
quadrillion
|
1991
|
zetta
|
Z
|
10007
|
1021
|
1000000000000000000000
|
sextillion
|
trilliard
|
1991
|
exa
|
E
|
10006
|
1018
|
1000000000000000000
|
quintillion
|
trillion
|
1975
|
peta
|
P
|
10005
|
1015
|
1000000000000000
|
quadrillion
|
billiard
|
1975
|
tera
|
T
|
10004
|
1012
|
1000000000000
|
trillion
|
billion
|
1960
|
giga
|
G
|
10003
|
109
|
1000000000
|
billion
|
milliard
|
1960
|
mega
|
M
|
10002
|
106
|
1000000
|
million
|
1873
|
kilo
|
k
|
10001
|
103
|
1000
|
thousand
|
1795
|
hecto
|
h
|
10002/3
|
102
|
100
|
hundred
|
1795
|
deca
|
da
|
10001/3
|
101
|
10
|
ten
|
1795
|
|
10000
|
100
|
1
|
one
|
–
|
deci
|
d
|
1000−1/3
|
10−1
|
0.1
|
tenth
|
1795
|
centi
|
c
|
1000−2/3
|
10−2
|
0.01
|
hundredth
|
1795
|
milli
|
m
|
1000−1
|
10−3
|
0.001
|
thousandth
|
1795
|
micro
|
µ
|
1000−2
|
10−6
|
0.000001
|
millionth
|
1873
|
nano
|
n
|
1000−3
|
10−9
|
0.000000001
|
billionth
|
milliardth
|
1960
|
pico
|
p
|
1000−4
|
10−12
|
0.000000000001
|
trillionth
|
billionth
|
1960
|
femto
|
f
|
1000−5
|
10−15
|
0.000000000000001
|
quadrillionth
|
billiardth
|
1964
|
atto
|
a
|
1000−6
|
10−18
|
0.000000000000000001
|
quintillionth
|
trillionth
|
1964
|
zepto
|
z
|
1000−7
|
10−21
|
0.000000000000000000001
|
sextillionth
|
trilliardth
|
1991
|
yocto
|
y
|
1000−8
|
10−24
|
0.000000000000000000000001
|
septillionth
|
quadrillionth
|
1991
|
|