Mulch Calculator

Worked example

A bed 10 m² in area with a mulch layer 5 cm deep needs 10 × 0.05 = 0.5 m³, which is 500 litres. In feet, a bed 100 ft² in area with a layer 3 inches deep needs 100 × 0.25 = 25 cubic feet.

How we calculated this

The volume of mulch is the area you want to cover multiplied by the depth of the layer. Length, width and depth are converted exactly, so you can mix metric and imperial units. The result is shown in cubic metres, cubic feet and litres.

This page gives a volume, not a weight, because the weight of a cubic metre depends on the type of mulch and how damp it is. It also does not choose a depth for you or work out how many bags to buy, because bag sizes differ between suppliers. Add extra yourself if you expect the layer to settle.

A result written as a plain number is exact. A result starting with “≈” has been rounded to 10 significant figures, because its exact decimal never ends or is too long to read comfortably. When an exact value is long, its full digits are shown underneath. The calculation itself is never rounded: only the display is.