A free app for Android, by despDev.

This application allows you to calculate the weight of various metals, such as steel, aluminum, copper, lead, tin, and more.

You can also calculate the length and weight of various shapes, such as round, square, hexagon, etc. 

The calculator is based on either the English or metric system. You can choose between the two systems and calculate in either inches or meters.

The resulting value can be converted into a number of grams, kilogram, pounds, ounces, or metric tons.

There is a choice of many different metals, and shapes. 

You can also calculate the length and weight of various shapes, such as round, square, hexagon, etc.