Milli-

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Milli redirects here. See Millie for similar-sounding words

Milli- (symbol m) is a prefix in the SI and other systems of units denoting a factor of 10⁻³, or 1/1,000.

Adopted in 1795, the prefix comes from the Latin mille, meaning one thousand (the plural is milia).

SI prefixes
1000ⁿ	10ⁿ	Prefix	Symbol	Since^[1]	Short scale	Long scale	Decimal equivalent in SI writing style
1000⁸	10²⁴	yotta-	Y	1991	Septillion	Quadrillion	1 000 000 000 000 000 000 000 000
1000⁷	10²¹	zetta-	Z	1991	Sextillion	Trilliard (thousand trillion)	1 000 000 000 000 000 000 000
1000⁶	10¹⁸	exa-	E	1975	Quintillion	Trillion	1 000 000 000 000 000 000
1000⁵	10¹⁵	peta-	P	1975	Quadrillion	Billiard (thousand billion)	1 000 000 000 000 000
1000⁴	10¹²	tera-	T	1960	Trillion	Billion	1 000 000 000 000
1000³	10⁹	giga-	G	1960	Billion	Milliard (thousand million)	1 000 000 000
1000²	10⁶	mega-	M	1960	Million		1 000 000
1000¹	10³	kilo-	k	1795	Thousand		1 000
1000^2/3	10²	hecto-	h	1795	Hundred		100
1000^1/3	10¹	deca-	da	1795	Ten		10
1000⁰	10⁰	(none)	(none)	NA	One		1
1000^−1/3	10⁻¹	deci-	d	1795	Tenth		0.1
1000^−2/3	10⁻²	centi-	c	1795	Hundredth		0.01
1000⁻¹	10⁻³	milli-	m	1795	Thousandth		0.001
1000⁻²	10⁻⁶	micro-	µ	1960^[2]	Millionth		0.000 001
1000⁻³	10⁻⁹	nano-	n	1960	Billionth	Milliardth	0.000 000 001
1000⁻⁴	10⁻¹²	pico-	p	1960	Trillionth	Billionth	0.000 000 000 001
1000⁻⁵	10⁻¹⁵	femto-	f	1964	Quadrillionth	Billiardth	0.000 000 000 000 001
1000⁻⁶	10⁻¹⁸	atto-	a	1964	Quintillionth	Trillionth	0.000 000 000 000 000 001
1000⁻⁷	10⁻²¹	zepto-	z	1991	Sextillionth	Trilliardth	0.000 000 000 000 000 000 001
1000⁻⁸	10⁻²⁴	yocto-	y	1991	Septillionth	Quadrillionth	0.000 000 000 000 000 000 000 001
Notes: 1. The 1795 dates identify prefixes in use since the metric system was introduced. The other dates are not necessarily dates of first use, but rather the date of recognition by a resolution of the CGPM, which first met in 1889. 2. The micron was earlier recognized by the CGPM in 1948; that decision was abrogated in 1967-68.