Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Thank you for visiting RF Cafe!
Innovative Power Products Combiners / Dividers

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
Prefix Symbol Name Multiplier
vendeko v decillionth 10-33
    nonillionth 10-30
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
xenna X octillion 1027
  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

 

Digital (Base 2)
Prefix Symbol Multiplier Value
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

 

IEC Version
Prefix Symbol Multiplier Value
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

 

Non-Technical Writing
Prefix Value
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

 

† 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.

 
Windfreak Technologies MPDevice microwave devices - RF Cafe
Res-Net Microwave - RF Cafe LadyBug Technologies LB5944A RF Power Sensor - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free