Units in everyday life are a headache. The most common ones are the following:

Length: meters, kilometers, feet, inches, miles, yards, etc.

Area: square feet, square kilometers, square miles, square meters, etc.

Volume: gallons, liters, quarts, pints, etc.

Weight: grams, ounces, pounds, tons, etc.

Time: hours, minutes, seconds, etc.

Funny thing is that when it comes to conversions, the exact result isn't that important. It's the process that is important, and this is what we try to make simpler. 

The app has a list of most units, which includes the most common and easy to use ones. In this list, there are also some more complex ones, but we try to make them simple and easy to use, so you don't have to be an expert to convert your units.