– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
Search facility:


| Site map | News | Contact us | [ FR ]
SI prefixes

Decimal multiples and submultiples of SI units can be written using the SI prefixes listed in the table below:

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

For full details please refer to Chapter 3 of the SI Brochure.