A metric units prefixes for numbers (SI prefixes).

Number prefixes SI#

Name	Symbol	Factor
yocto	y	0,000 000 000 000 000 000 000 001 = 10^-24
zepto	z	0,000 000 000 000 000 000 001 = 10^-21
atto	a	0,000 000 000 000 000 001 = 10^-18
femto	f	0,000 000 000 000 001 = 10^-15
pico	p	0,000 000 000 001 = 10^-12
nano	n	0,000 000 001 = 10^-9
micro	µ	0,000 001 = 10^-6
mili	m	0,001 = 10^-3
centi	c	0,01 = 10^-2
deci	d	0,1 = 10^-1
		1
deca	da	10 = 10¹
hecto	h	100 = 10²
kilo	k	1000 = 10³
mega	M	1000 000 = 10⁶
giga	G	1000 000 000 = 10⁹
tera	T	1000 000 000 000 = 10¹²
peta	P	1000 000 000 000 000 = 10¹⁵
exa	E	1000 000 000 000 000 000 = 10¹⁸
zetta	Z	1000 000 000 000 000 000 000 = 10²¹
yotta	Y	1000 000 000 000 000 000 000 000 = 10²⁴

Some facts#

SI prefixes are systematic way to write "very big" or "very small" numbers. For example we can use kilo prefix and say one kilo-gram (1kg) instead of saying 1000 grams (1000g). In similar way we can create other units like GHz (giga-herz), MV (mega-volt), cm (centi-metre) etc. Each SI prefix has related factor, which it replaces.
SI prefixes are created over metric system. It means that base factor is 10 and its powers. However, after big growth of digital technology, it turned out that it's sometimes useful to use factors based on binary system. That is the reason why alternative system was created - binary prefixes. Binary prefixes are specially popular in computer science.

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przedrostki_SI · nano · piko · mikro · mili · kilo · mega · giga · tabela_przedrostkow_si · wielokrotnosci_jednostek

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