This simple Android app from Tundra Apps will calculate the quantity of concrete needed for various projects, such as driveways, floors, walls, and columns. The results come either as cubic yards or bags of pre-mixed concrete and can be saved for similar future projects—either in metric or U.S. units. It also calculates costs based on unit costs and can email the specs to a supplier. The app is available at the Android market for $0.99.