You can visit the Software Informer database in order to find a converting program for your needs. Personally, I recommend you Metric Convertor because it's free of charge and is able to convert units from a wide range of categories including length, weight, area, volume, or temperature. Also, you can use Unit Converter which is an online service that, besides the classic categories, allows you to convert engineering, fluids, radiology, electricity, magnetism or heat units.
