Converticious is a free website that will convert differents units.

See Units list
How to : Select a converter, enter a value, choose the units, choose number of decimal if you want
For example : You can use the Data Byte converter to estimate your
webhosting bandwidth data transfer amounts
in different units.More units will be added soon...
Faq : Decimal number (example) : use a point like this 1.5 = one and one half
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