Coverage Calculator Coverage Calculator 1. Determine how deep the application should be. Depth: .5 inch1 inch2 inches3 inches4 inches5 inches6 inches7 inches8 inches9 inches10 inches11 inches12 inches 2. Determine the area to be covered. SQUARE / RECTANGLE Length (in feet): Width (in feet): Calculate CIRCLE Diameter (in feet): Calculate TRIANGLE Measure along the 90° angleSide one (in feet): Side two (in feet): Calculate Total Area (sq. ft.): 3. Result. You will need: cubic yard(s), or 1-cubic-foot bag(s) PRINT PAGE