RF Cafe - Numerical Prefixes: Mathematical, Digital, IEC

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Numerical Prefixes: Mathematical, Digital, IEC

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	10^google

† 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.

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

Thanks to Duncan for the zepto info

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