Mulch Calculator – Cubic Yards, Bags & Cost

Calculate mulch volume from bed dimensions or a known square-foot area, round up to whole bags, and optionally compare bagged versus bulk cost.

Bed length (ft)Bed width (ft)Known total area (sq ft, optional)Mulch depth (in)Bag size (cu ft)Price per bag ($, optional)Bulk price per cu yd ($, optional)

Ready.
Enter your measurements and calculate.

Worked example

Example

A 20 × 10 ft bed at 3 inches deep needs 50 cu ft, or about 1.85 cu yd. With 2 cu ft bags, that is 25 bags.

References

Sources & assumptions

The Home Depot — mulch and topsoil calculator

Last reviewed September 1, 2026. Defaults are starting points; product-specific inputs are editable wherever coverage varies.

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FAQ

Common questions

How many cubic feet are in a yard?

27 cubic feet.

Can I use 1.5 cu ft bags?

Yes; change the bag-size input.

Does depth matter a lot?

Yes. Doubling depth doubles volume.