I  U  P  A  C

News & Notices

Organizations & People

Standing Committees



..By Year
..Other Committees




Links of Interest

Search the Site

Home Page


Abbreviated list of quantities, units and symbols in physical chemistry

 2. SI prefixes

Prefixes to form the names and symbols of the decimal multiples and submultiples of SI units.*

Multiple Prefix Symbol
10-24 yocto  y
10-21 zepto z
10-18 atto a
10-15 femto f
10-12 pico p
10-9 nano n
10-6 micro  µ
10-3 milli m
10-2 centi c
10-1 deci d
10 deca da
102 hecto h
103 kilo k
106 mega M
109 giga G
1012 tera T
1015 peta P
1018 exa E
1021 zeta Z
1024 yotta Y

* Decimal multiple and submultiples of the unit of mass are formed by attaching prefixes to gram, examples: mg, not µkg; Mg, not kkg.

Page last modified 29 May 2000.
Copyright © 2000 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact web manager.