JGMsmart.UC is an easy-to-use converter for physical units. It provides 16 dimensions and about 220 units.
When a specific conversion is missing, it can be added with a built-in editor easily. Also for calculating the conversions a build-in expression parser is used. Thereby it is possible to realize complex conversions.
Moreover, the unused units or quantities can easily be hidden so that they no longer appear in the selection fields. Frequently used conversions can be organized into favorites.