Topsoil Calculator

How to use this calculator

Enter Length (ft), Width (ft), Depth (in). The result updates in your browser as you edit an input. The prefilled values are examples only.

How the estimate works

Multiply length and width by depth converted to feet, then divide cubic feet by 27.

What can change the answer?

Actual bed shape and settled depth may differ from a simple rectangle. Measure several spots when the ground slopes or the depth changes.

Before relying on the result

Measure the area and intended added depth using the units shown. Calculate deeper low spots separately from a uniform layer. The result is geometric volume before an allowance for settling or compaction; confirm ordering units and material suitability with your supplier.

Further reference

Our garden material units guide explains the conversion from area and depth to cubic feet and cubic yards. The geometry is the same for an even rectangular layer; soil suitability, compaction and delivered quantity require separate checks with your supplier.

Worked example with the default inputs

A 15-by-8-foot area with a 4-inch layer contains 40 cubic feet, or 1.48 cubic yards. Weight cannot be determined from volume alone because moisture and material density vary.

Interpret the result in a planning record

The topsoil calculator uses the same volume calculation with the depth you enter. Measure the intended coverage area and distinguish an added layer from filling a deeper low spot. Ground that slopes or changes depth may need several separate calculations. Ask the supplier how the material is measured and sold before turning the estimate into an order.

Save the input values, units and result together. Change one uncertain input at a time so you can see which assumption moves the answer. A displayed decimal is arithmetic precision, rather than evidence that the measurements or rates are equally precise.

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Read the How to Measure a Lawn and Read Product Rates guide →