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These are the commonly used numerical prefixes in the English language, but most
seem to have bases similar to words in European languages; e.g., French, Latin,
and Greek. * These prefixes were declared in 2022 by the
General Conference on Weights and Measures in Versailles, France.
| vendeko |
v |
decillionth |
10-33 |
| quecto* |
|
nonillionth |
10-30 |
ronto*
xenno |
x |
octillionth |
10-27 |
| yocto |
y |
septillionth |
10-24 |
| zepto |
z |
sextillionth |
10-21 |
| atto |
a |
quintillionth |
10-18 |
| femto |
f |
quadrillionth |
10-15 |
| pico |
p |
trillionth |
10-12 |
| nano |
n |
billionth |
10-9 |
| micro |
µ |
millionth |
10-6 |
| milli |
m |
thousandth |
10-3 |
| centi |
c |
hundredth |
10-2 |
| deci |
d |
tenth |
10-1 |
| deka |
da |
ten |
101 |
| hecto |
h |
hundred |
102 |
| kilo |
k |
thousand |
103 |
| mega |
M |
million |
106 |
| giga |
G |
billion† |
109 |
| tera |
T |
trillion† |
1012 |
| peta |
P |
quadrillion |
1015 |
| exa |
E |
quintillion |
1018 |
| zetta |
Z |
sextillion |
1021 |
| yotta |
Y |
septillion |
1024 |
ronna*
xenna |
X |
octillion |
1027 |
| quetta* |
V |
nonillion |
1030 |
| vendeka |
V |
decillion |
1033 |
| |
|
undecillion |
1036 |
| |
|
duodecillion |
1039 |
| |
|
tredecillion |
1042 |
| |
|
quattodecillion |
1045 |
| |
|
quindecillion |
1048 |
| |
|
sexdecillion |
1051 |
| |
|
septendecillion |
1054 |
| |
|
octodecillion |
1057 |
| |
|
novemdecillion |
1060 |
| |
|
vigindecillion |
1063 |
| |
|
googol |
10100 |
| |
|
googolplex |
10google |
|
| peta |
P |
250 |
1,125,899,906,842,624 |
| tera |
T |
240 |
1,099,511,627,776 |
| giga |
G |
230 |
1,073,741,824 |
| Mega |
M |
220 |
1,048,576 |
| kilo |
k |
210 |
1,024 |
| exbi |
Ei |
260 |
1,152,921,504,606,846,976 |
| pebi |
Pi |
250 |
1,125,899,906,842,624 |
| tebi |
Ti |
240 |
1,099,511,627,776 |
| gibi |
Gi |
230 |
1,073,741,824 |
| mebi |
Mi |
220 |
1,048,576 |
| kibi |
Ki |
210 |
1,024 |
| uni, mono |
1 |
| bi |
2 |
| tri |
3 |
| quadr |
4 |
| quint, penta |
5 |
| hex, sex |
6 |
| hept, sept |
7 |
| octo |
8 |
| novem |
9 |
| deca, deka |
10 |
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† 1,000,000,000 is called "one billion" in the U.S., U.K., France (before May
3, 1961), Brazil, Puerto Rico, Greece, and in Italy, Russia and Turkey it is referred
to as "one billion" when written out, but as "one milliard" when written as 109.
1,000,000,000,000 is called "one trillion" in the U.S., but is called "one billion"
in Germany, the Netherlands, Austria, Sweden, Norway, Denmark, Finland, France (after
May 3, 1961), Portugal, Poland. It is best to check for current definitions for
each country to be certain to get it right, or better yet, just write it out numerically
to avoid confusion.
Thanks to Duncan for the zepto info.
Posted April 17, 2004
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