Garden bed planner

Mulch Calculator

Add each garden bed, set the depth you want and pick a bag size. You get the total mulch volume, the number of bags, and whether bulk delivery works out cheaper.

Garden beds

Cubic yards
Bags
Total area (ft²)
Cubic feet
Cost in bags
Cost in bulk

Calculated on your device. Nothing is uploaded to a server.

How to use the mulch calculator

  1. Add your bedsEnter each bed's length and width, or its diameter for a round bed.
  2. Choose depth and bagA depth of 2 to 3 in (5 to 8 cm) suits most beds. Then pick the bag size sold near you.
  3. Compare pricesEnter bag and bulk prices to see which is cheaper for your total volume.

How much mulch do you need?

Mulch is sold by volume, either in bags of 2 or 3 cubic feet (40 to 70 liters in metric countries) or in bulk by the cubic yard or cubic meter. The calculator finds the area of each bed, multiplies the total by the depth to get the volume, and divides by the bag size. Bags are rounded up to whole bags. One cubic yard covers about 324 square feet at 1 inch deep, 162 square feet at 2 inches or 108 square feet at 3 inches. For larger areas, bulk delivery is often cheaper than bags. Enter both prices to compare them.

Recommended depth

Use 2 to 3 inches for most beds and 3 to 4 inches around trees. Keep mulch a few inches away from stems and trunks to prevent rot.

Topping up

If old mulch is still in place, you usually only need about 1 inch of fresh mulch to refresh the color and cover.

Mulch Calculator FAQ

How many bags of mulch are in a cubic yard?

There are 27 cubic feet in a cubic yard, so it takes 13.5 bags of 2 cubic feet or 9 bags of 3 cubic feet.

How deep should mulch be?

Most gardeners use 2 to 3 inches (5 to 8 cm). Thinner layers let weeds through, and mulch much deeper than 4 inches can starve roots of air.

Can I mix round and rectangular beds?

Yes. Set each bed's shape separately. A round bed uses the first dimension as its diameter.

Is bulk mulch cheaper than bags?

Usually yes for more than about 2 to 3 cubic yards, but delivery fees vary. Enter both prices to compare them for your project.

Are my beds saved?

Yes. Your beds and settings are saved in your browser's local storage on this device only.

Try other free tools

More handy calculators from My Panda Toolbox.