Topsoil Calculator

Multiply the bed area in square feet by the depth in feet to get cubic feet, then divide by 27 for cubic yards. A 20 by 10 foot bed at 6 inches deep works out to 100 cubic feet, which is about 3.7 cubic yards.

It divides the depth by 12 to turn inches into feet, then multiplies by the area. So 6 inches becomes 0.5 feet, and a 200 square foot bed at that depth holds 100 cubic feet of soil.

A cubic yard is 27 cubic feet, so it equals 36 of the common 0.75 cubic foot bags. The bag count here always rounds up to a whole bag, since you cannot buy part of one.

Bags are sold whole, so any leftover fraction of a bag becomes one more bag. The tool guards against floating point drift, so a volume that divides evenly (like 75 cubic feet into exactly 100 bags) does not spill into an extra bag.

This tool figures roughly 2160 pounds, or about 1.08 US tons, per cubic yard. Real topsoil ranges from about 1800 to 2500 pounds per cubic yard depending on moisture and organic content, so treat the weight as a planning estimate.

New lawns and flower beds usually want 4 to 6 inches, while raised vegetable beds often want 8 to 12 inches. Set the depth field to match your project, since depth drives the volume more than most people expect.

Yes. Soil settles once watered and beds are rarely perfectly level, so ordering around 5 to 10 percent more than the exact figure helps you avoid a second trip or delivery.

It assumes a rectangle (length times width). For a circle, estimate the area separately (pi times radius squared) and pad the depth into an equivalent rectangle, or split an L shape into rectangles and add the results.

Yes. The math runs entirely in your browser, so the dimensions you type are never uploaded or stored on a server.