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SI prefixes

Common (black) and uncommon (grey) SI unit prefixes.
Prefix Meaning Abbreviation Exponential
Notation
Yotta- septillion Y 1024
Zetta- hexillion Z 1021
Exa- quintillion E 1018
Peta- quadrillion P 1015
Tera- trillion T 1012
Giga- billion G 109
Mega- million M 106
kilo- thousand k 103
hecto- hundred h 102
deka- ten da 101
deci- tenths of d 10-1
centi- hundredths of c 10-2
milli- thousandths of m 10-3
micro- millionths of µ 10-6
nano- billionths of n 10-9
pico- trillionths of p 10-12
femto- quadrillionths of f 10-15
atto- quintillionths of a 10-18
zepto- hexillionths of z 10-21
yocto- septillionths of y 10-24

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General Chemistry Online! SI prefixes

Copyright © 1997-2005 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 06/16/05.URL: http://antoine.frostburg.edu/chem/senese/101/measurement/SIprefixes.shtml