ORDERS(7) NetBSD Miscellaneous Information Manual ORDERS(7)
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 pre-
fixes. 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.
NetBSD 5.0 August 6, 2011 NetBSD 5.0
