SI prefixes

In force

(regulation 7)

Item	Numerical Value	Name	Symbol
1	1024	yotta	Y
2	1021	zetta	Z
3	1018	exa	E
4	1015	peta	P
5	1012	tera	T
6	109	giga	G
7	106	mega	M
8	103	kilo	k
9	102	hecto	h
10	101	deka	da
11	10–1	deci	d
12	10–2	centi	c
13	10–3	milli	m
14	10–6	micro	µ
15	10–9	nano	n
16	10–12	pico	p
17	10–15	femto	f
18	10–18	atto	a
19	10–21	zepto	z
20	10–24	yocto	y

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