Fact sheet: Number prefixes used in the SI system (Wikipedia)

Posted on August 26, 2010 by


Well organized tables showing what the number prefixes—micro, nano, mega, giga, etc—mean and how to replace them with numbers. (FYI: in the United States and the United Kingdom, the ‘short scale’ is used.)

Note: gigabyte, megabyte, kilobyte, use a slightly different meaning for the prefixes. This can be a little confusing. The Wikipedia article has a nice little discussion of the difference between that and the SI usage.


Wikipedia is an open-source encyclopedia. It’s science articles are often of high quality–well organized, in depth, and with great illustrations, graphics and cross-references.