SI units
'SI' is an abbreviation for Standard International. The name given to the standard metric system of units.
Note: this page is simply a collection links to the names of SI units and their prefixes and multiples. For further information, see the Wikipiedia articles and .
Base units
Derived units
Supplementary units
SI prefixes
The prefixes kibi-, mebi-, gibi-, tebi-, pebi-, and exbi- were adopted by the IEC and NIST to express binary multiples.
Commonly used multiples of units
- The table below shows which prefixes are most commonly used with each unit. In theory, any combination of a prefix and a unit is possible. In practice, only those multiples that are of practical use are used. Multiples towards the left and right of the table tend to gain currency as advances in technology and miniaturisation make them meaningful.
- Links are to combinations that are in relatively common scientific use. Blank entries indicates combinations that are rare or not used.
- Notes:
Units are ordered alphabetically by their symbol. Prefixes are ordered from largest to smallest.
It is the gram (g) that takes prefixes, not the kilogram.
Some combinations have special names; for example, 106 grams is called a tonne, not a "megagram".
The multiples in the grey columns are not in official scientific usage.
The table lists multiples of SI units only. Other units that use the SI prefixes, such as kilobyte and millibar, are not given here.
The table is currently incomplete. More links will be added later.
(Sources: ; Oxford English Dictionary, 2nd ed.)
