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ORDERS(7)	     BSD 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.

BSD				August 6, 2011				   BSD

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