Mulch, soil and gravel calculator
Pick the shape of the bed, path or driveway, enter its dimensions and the depth of the layer you want to spread. The calculator returns the volume of the layer, in cubic feet and cubic yards or in cubic metres and litres.
To get a number of bags, type the volume printed on the bag you plan to buy. Leave that field empty if you buy loose by the cubic yard or cubic metre.
Volume of the layer 18 ft³ In cubic yards 0.667 yd³
Method and limitations
Rectangle: volume = length × width × depth. Circle: volume = π × (diameter ÷ 2)² × depth. Metric: lengths in metres and depth in centimetres, so volume in m³ = length × width × depth ÷ 100, and 1 m³ = 1,000 L. Imperial: lengths in feet and depth in inches, so volume in ft³ = length × width × depth ÷ 12, and 1 yd³ = 27 ft³. Bags = volume ÷ volume of one bag, rounded up to a whole bag; the bag volume is the one you read on the label, in litres (metric) or cubic feet (imperial), and no bag size is assumed. The result is the volume of a flat, level layer: no allowance is made for settling, slopes, uneven ground, compaction or waste, and no weight or density is computed. This is a geometric calculation, so no external source is needed.
Sources
No external reference is documented for this calculation; its method and limitations are described above.
