NAME

orders — orders of magnitude

DESCRIPTION

The following table lists common multiples of bytes.

Name	Prefix	Power of 2	Power of 10
Kilobyte	kB	2^10	10^3
Megabyte	MB	2^20	10^6
Gigabyte	GB	2^30	10^9
Terabyte	TB	2^40	10^12
Petabyte	PB	2^50	10^15
Exabyte	EB	2^60	10^18
Zettabyte	ZB	2^70	10^21
Yottabyte	YB	2^80	10^24

The following table lists common bit rates as a power of ten.

Name	Prefix	Bit per second	Byte per second
Bit per second	bit/s	1	0.125
Byte per second	B/s	8	1
Kilobit per second	kbit/s	10^3	125
Kilobyte per second	kB/s	8 * 10^3	1000
Megabit per second	Mbit/s	10^6	125000
Megabyte per second	MB/s	8 * 10^6	1000000
Gigabit per second	Gbit/s	10^9	125000000
Gigabyte per second	GB/s	8 * 10^9	1000000000
Terabit per second	Tbit/s	10^12	125000000000
Terabyte per second	TB/s	8 * 10^12	1000000000000

The following table lists common orders of magnitude as a power of ten.

Name	Order	Prefix	Symbol	Decimal
Septillionth	10^-24	yocto	y	0.000000000000000000000001
Sextillionth	10^-21	zepto	z	0.000000000000000000001
Quintillionth	10^-18	atto	a	0.000000000000000001
Quadrillionth	10^-15	femto	f	0.000000000000001
Trillionth	10^-12	pico	p	0.000000000001
Billionth	10^-9	nano	n	0.000000001
Millionth	10^-6	micro	mu	0.000001
Thousandth	10^-3	milli	m	0.001
Hundredth	10^-2	centi	c	0.01
Tenth	10^-1	deci	d	0.1
One	10^0	-	-	1
Ten	10^1	deca	da	10
Hundred	10^2	hecto	h	100
Thousand	10^3	kilo	k	1000
Million	10^6	mega	M	1000000
Billion	10^9	giga	G	1000000000
Trillion	10^12	tera	T	1000000000000
Quadrillion	10^15	peta	P	1000000000000000
Quintillion	10^18	exa	E	1000000000000000000
Sextillion	10^21	zetta	Z	1000000000000000000000
Septillion	10^24	yotta	Y	1000000000000000000000000

SEE ALSO

units(1), strsuftoll(3), number(6)

STANDARDS

There have been various attempts to standardize the set of binary prefixes. Organizations such as International Electrotechnical Commission (IEC) have proposed new prefixes such as “kibi”, “mebi”, “gibi”, and “yobi”, but the adoption has been slow at best.