Metric prefixes

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Metric prefixes in everyday use
Text	Symbol	Factor	Power
exa	E	7018100000000000000?1000000000000000000	1018
peta	P	7015100000000000000?1000000000000000	1015
tera	T	7012100000000000000?1000000000000	1012
giga	G	7009100000000000000?1000000000	109
mega	M	7006100000000000000?1000000	106
kilo	k	7003100000000000000?1000	103
hecto	h	100	102
deca	da	10	101
(none)	(none)	1	100
deci	d	0.1	10-1
centi	c	0.01	10-2
milli	m	0.001	10-3
micro	µ	6994100000000000000?0.000001	10-6
nano	n	6991100000000000000?0.000000001	10-9
pico	p	6988100000000000000?0.000000000001	10-12
femto	f	6985100000000000000?0.000000000000001	10-15
atto	a	6982100000000000000?0.000000000000000001	10-18

The International Bureau of Weights and Measures (BIPM) specifies twenty prefixes for the International System of Units (SI).

List of SI prefixes

Prefix		Base 1000	Base 10	Decimal	English word		Adoption
Name	Symbol				Short scale	Long scale
yotta	Y	10008	1024	1000000000000000000000000	septillion	quadrillion	1991
zetta	Z	10007	1021	1000000000000000000000	sextillion	trilliard	1991
exa	E	10006	1018	1000000000000000000	quintillion	trillion	1975
peta	P	10005	1015	1000000000000000	quadrillion	billiard	1975
tera	T	10004	1012	1000000000000	trillion	billion	1960
giga	G	10003	109	1000000000	billion	milliard	1960
mega	M	10002	106	1000000	million	million	1873
kilo	k	10001	103	1000	thousand	thousand	1795
hecto	h	10002/3	102	100	hundred	hundred	1795
deca	da	10001/3	101	10	ten	ten	1795
		10000	100	1	one	one	–
deci	d	1000-1/3	10-1	0.1	tenth	tenth	1795
centi	c	1000-2/3	10-2	0.01	hundredth	hundredth	1795
milli	m	1000-1	10-3	0.001	thousandth	thousandth	1795
micro	µ	1000-2	10-6	0.000001	millionth	millionth	1873
nano	n	1000-3	10-9	0.000000001	billionth	milliardth	1960
pico	p	1000-4	10-12	0.000000000001	trillionth	billionth	1960
femto	f	1000-5	10-15	0.000000000000001	quadrillionth	billiardth	1964
atto	a	1000-6	10-18	0.000000000000000001	quintillionth	trillionth	1964
zepto	z	1000-7	10-21	0.000000000000000000001	sextillionth	trilliardth	1991
yocto	y	1000-8	10-24	0.000000000000000000000001	septillionth	quadrillionth	1991