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Numerical Prefixes: Mathematical, Digital, IEC

These are the commonly used numerical prefixes in the English language, but most seem to translate with European languages.

Mathematical
PrefixSymbolNameMultiplier
vendekovdecillionth10-33
  nonillionth10-30
xennoxoctillionth10-27
yoctoyseptillionth10-24
zeptozsextillionth10-21
attoaquintillionth10-18
femtofquadrillionth10-15
picoptrillionth10-12
nanonbillionth10-9
microµmillionth10-6
millimthousandth10-3
centichundredth10-2
decidtenth10-1
dekadaten101
hectohhundred102
kilokthousand103
megaMmillion106
gigaGbillion109
teraTtrillion1012
petaPquadrillion1015
exaEquintillion1018
zettaZsextillion1021
yottaYseptillion1024
xennaXoctillion1027
 Vnonillion1030
vendekaVdecillion1033
  undecillion1036
  duodecillion1039
  tredecillion1042
  quattodecillion1045
  quindecillion1048
  sexdecillion1051
  septendecillion1054
  octodecillion1057
  novemdecillion1060
  vigindecillion1063
  googol10100
  googolplex10google

 

Digital (Base 2)
PrefixSymbolMultiplierValue
petaP2501,125,899,906,842,624
teraT2401,099,511,627,776
gigaG2301,073,741,824
MegaM2201,048,576
kilok2101,024

 

IEC Version
PrefixSymbolMultiplierValue
exbiEi2601,152,921,504,606,846,976
pebiPi2501,125,899,906,842,624
tebiTi2401,099,511,627,776
gibiGi2301,073,741,824
mebiMi2201,048,576
kibiKi2101,024

 

Non-Technical Writing
PrefixValue
uni,  mono1
 bi2
  tri3
quadr4
quint, penta 5
  hex, sex6
hept, sept7
octo8
novem9
deca, deka10

 

† 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.

 
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