Engineering Unit Converter

Converting unit can be educational!
This is a comprehensive engineering unit converter with an intuitive spinning wheel interface. Internet access is not required to use the converter.
Choose a category such as length, energy, entropy, electric charge, etc., from a list. The available units appear in two spinning wheels. Spin the wheels to select ‘From Unit’ and ‘To Unit’. That is it. You can change the input value in the yellow field, sort units, or use the swap button. Additional info about a measure is displayed when the help button is pressed. Currently there are 50 categories with more than 500 units.