A free program for Android, by Xtell Technologies.

This is a handy utility for calculating and converting units of weight, from the most basic to the most complex. It is very easy to use and it is completely free. The main advantage of this app is that it allows you to convert from one unit to another, and it gives you the option to choose between the most commonly used units, such as kilogram, milligram, ounce, pound, ton, etc. 

The app is useful for many reasons. First of all, it is free, so there is no need to pay for the app. It is also very easy to use and is designed to be used by people of all ages. The user interface of the app is simple and intuitive. In addition, the app allows you to choose between the most commonly used units of weight, such as kilogram, milligram, ounce, pound, ton, etc.