meaSure

MeaSure is a simplified
unit-conversion utility you can use to calculate values between a wide range
of different standard units. It will convert over 120 different
measurements, grouped in 12 general categories, including Length, Area,
Volume, Capacity (fluid & dry), Mass, Speed, Temperature, Work, Power,
Pressure, and Numbers. Once the values you need are converted, the answer
can be copied/pasted to the Clipboard for transfer to another application.
MeaSure is simple to use and easy to navigate and offers a multilingual
interface with text entries shown in four different languages (English,
Italian, German, or Spanish).