Skip to content
Calixo

Mulch Calculator

Find how many cubic yards of mulch you need to cover a garden bed.

Inputs

2-4 inches is typical for most garden beds.

Saved Scenarios

— select 2+ to compare

Mulch Needed (cu yd)

4.63

Spark says

How it's calculated

Formula

Cubic Yards=Area×Depthin324Cubic\ Yards = \dfrac{Area \times Depth_{in}}{324}
324
— Square feet covered by 1 cubic yard at 1 inch depth (27 cu ft × 12 in/ft)

What is the Mulch Calculator?

Mulch is sold by the cubic yard — this calculator converts an area and target depth into the volume needed, using the standard conversion that one cubic yard covers 324 square feet at one inch of depth.

How to use it

  1. 1 Enter the area of your garden bed.
  2. 2 Enter your target mulch depth.

Worked examples

500 sq ft bed, 3" deep

About 4.63 cubic yards needed.

Try it

Limitations

  • •Actual mulch settles over time, so beds may need topping up seasonally — this gives the initial fill volume, not ongoing maintenance needs.

Frequently asked questions

How deep should mulch be?

2-4 inches is typical — too thin doesn't suppress weeds effectively, while excessive depth (over 4-6 inches) can smother roots and promote fungal issues.