University of Florida

Calculating Mulch

Mulch is an important component in Florida-Friendly yards, but how do you know how much mulch to buy?

Start by calculating the square footage of the area you want to cover. For rectangular beds, multiply the length times the width.

Next, decide how deep the mulch should be. Three inches is a good rule of thumb. You need the depth measurement to be in feet, so divide your three-inch measurement by twelve.

Finally, multiply the depth times the area, which will give you the cubic feet needed.

So for a 12-by-12 bed, you'll need to cover 144 square feet. If you want a three-inch layer of mulch, you'll need 36 cubic feet.

Garden centers typically sell bags of mulch containing two or three cubic feet. You can also order mulch in bulk, though it's sold by the cubic yard.

UF/IFAS Publications

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