orders(7) - NetBSD Manual Pages

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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 6.1.3                    August 6, 2011                    NetBSD 6.1.3