The Super Unit Converter application is one of the best tools for converting units. The main reason for this is that the developers have made the user interface very easy to use. 

The first thing that you need to do is select the units that you want to convert. You can select from the following categories: length, mass, volume, time, temperature, energy, and speed. Once you have selected the units that you want to convert, you need to enter the value that you want to convert.

The conversion will take place automatically, and the results will be displayed. If you want to check the results, you can simply click on the "Check results" button.