Volume Calculator Use the calculator to see how much gravel, play and mortar sand, topsoil, soil-mixes or mulch you need. Press “Calculate” when done entering the fields. Material Calculator Width (feet): Length (feet): Depth (inches): Material Type: Bark Mulch, Pine Nuggets, Playground Mulch Topsoil, Soil Blends, Fill Soil Play Sand, Masonry Sand, Rock Sand Crusher Run Stone Driveway Gravel #57, 67, 78 Decorative Landscape Stone Brick Chips Calculate Reset