This App is a simple calculator to make concrete or mortar: enter the dimensions of your project and you will get the amount of cement and sand and gravel to order.
Depending on the type of mixer you selected, you will get results in terms of bags or liters.
The "Settings" tab is common to all projects.
Take care that this tool is designed for standard case: refer to your material provider for detailed instructions.
All texts are in english and using international system of units: kg, litre, meter,... Yet there is an experimental option that converts measures and results in lbs and ft^3.