Windows: Whether you need to perform a conversion of a common unit of measurement or an obscure one, Converber should have you covered. Converber is a portable conversion tool with the ability to convert hundreds of units of measurement.
Converber's library of units has more than 300 entries in 22 categories including acceleration, electric current, flow, volume and more. On the off chance that there is a conversion not accounted for, adding it is as simple as opening up the built-in conversion editor and adding it to the collection.
You can par down the list to a more manageable volume by setting up favourites for frequently used conversion or simply telling Converber to only show you commonly used conversions. Converber is freeware, portable and Windows only.