A free program for Android, by Mobile ASUSTek Computer Inc..

ASUS Calculator – unit converter is a handy application that is designed to calculate and convert units. This app is a comprehensive tool for those who need to perform complex mathematical calculations. It can also be used to convert measurements. It has an easy and intuitive interface, which makes it very user-friendly. It can be used for different types of calculations, such as addition, subtraction, multiplication, division, and more.

It is capable of performing calculations in many different ways. For instance, you can use it to add or subtract two numbers, or to multiply or divide by a number, or to find the square or square root of a number, etc. 

This is an extremely useful app, which is capable of performing complex calculations.