List of Prefixes for Basic Metric Units

Prefixes for Basic Metric Units

Multiples
Prefix	Abbreviation	Power of 10	Equivalent
deka- or deca-	da	101	ten
hecto-	h	102	hundred
kilo-	k	103	thousand
mega-	M	106	million
giga-	G	109	billion
tera-	T	1012	trillion
peta-	P	1015	quadrillion
exa-	E	1018	quintillion
zetta-	Z	1021	sextillion
yotta-	Y	1024	septillion
Fractions
Prefix	Abbreviation	Power of 10	Equivalent
deci-	d	10−1	tenth
centi-	c	10−2	hundredth
milli-	m	10−3	thousandth
micro-	μ	10−6	millionth
nano-	n	10−9	billionth
pico-	p	10−12	trillionth
femto-	f	10−15	quadrillionth
atto-	a	10−18	quintillionth
zepto-	z	10−21	sextillionth
yocto-	y	10−24	septillionth