
Metric Prefixes
Prefix |
Symbol |
1000m |
10n |
Decimal |
Short scale1 |
Long scale1 |
yotta |
Y |
10008 |
1024 |
1,000,000,000,000,000,000,000,000.00 |
Septillion |
Quadrillion |
zetta |
Z |
10007 |
1021 |
1,000,000,000,000,000,000,000.00 |
Sextillion |
Trilliard |
exa |
E |
10006 |
1018 |
1,000,000,000,000,000,000.00 |
Quintillion |
Trillion |
peta |
P |
10005 |
1015 |
1,000,000,000,000,000.00 |
Quadrillion |
Billiard |
tera |
T |
10004 |
1012 |
1,000,000,000,000.00 |
Trillion |
Billion |
giga |
G |
10003 |
109 |
1,000,000,000.00 |
Billion |
Milliard |
mega |
M |
10002 |
106 |
1,000,000.00 |
Million |
kilo |
k |
10001 |
103 |
1,000.00 |
Thousand |
hecto |
h |
10002/3 |
102 |
100.00 |
Hundred |
deca |
da |
10001/3 |
101 |
10.00 |
Ten |
|
|
10000 |
100 |
1.00 |
One |
deci |
d |
1000-1/3 |
10-1 |
0.10 |
Tenth |
centi |
c |
1000-2/3 |
10-2 |
0.01 |
Hundredth |
milli |
m |
1000-1 |
10-3 |
0.001 |
Thousandth |
micro |
µ |
1000-2 |
10-6 |
0.000001 |
Millionth |
nano |
n |
1000-3 |
10-9 |
0.000000001 |
Billionth |
Milliardth |
pico |
p |
1000-4 |
10-12 |
0.000000000001 |
Trillionth |
Billionth |
femto |
f |
1000-5 |
10-15 |
0.000000000000001 |
Quadrillionth |
Billiardth |
atto |
a |
1000-6 |
10-18 |
0.000000000000000001 |
Quintillionth |
Trillionth |
zepto |
z |
1000-7 |
10-21 |
0.000000000000000000001 |
Sextillionth |
Trilliardth |
yocto |
y |
1000-8 |
10-24 |
0.000000000000000000000001 |
Septillionth |
Quadrillionth |
Notes:
-
The long and short scales are two of several large-number naming systems for integer powers of ten that use the same words with different meanings:
Long scale: Every new term greater than million is one million times larger than the previous term. Thus, billion means a million millions (1012), trillion means a million billions (1018), and so on.
Short scale: Every new term greater than million is one thousand times larger than the previous term. Thus, billion means a thousand millions (109), trillion means a thousand billions (1012), and so on.
See Wikipedia for more information.
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