Calculator Landscape Material Coverage Calculator Coverage Calculator Choose material:Rock 3/4″ and 1″Rock 1/2″ and 5/8″Rock 1/4″ and 3/8″ABC RoadbaseSandFill DirtTop SoilSoil MixesCompostMulch Width of area: (in feet) Length of area: (in feet) Desired depth: (in inches) You’ll need for your project.