Mulch Calculator

Landscaping

Mulch Calculator

Calculate cubic yards and bags of mulch for garden beds and landscaping projects.

Mulch Bed

Recommended Mulch
1.56 yd³
Includes 5% allowance
Cubic Feet42 ft³
2 ft³ Bags21
3 ft³ Bags14
Estimated Cost—
Mulch settles over time. Use the installation depth recommended for the mulch type and landscape purpose.

How Much Mulch Do I Need?

Enter the length and width of your landscape bed and the desired mulch depth. The calculator converts the volume into cubic feet, cubic yards and common bag sizes.

Mulch Calculation Formula

Volume = Length × Width × Depth

When depth is entered in inches, it is converted to feet before calculating volume.

Depth matters: The correct mulch depth depends on the material, plants, drainage and whether the goal is appearance, moisture retention or weed suppression.

Bulk Mulch vs Bagged Mulch

Bagged mulch is convenient for smaller garden beds and can be easier to transport in a car. Bulk mulch is often more practical for larger landscape projects.

Example

A bed measuring 20 ft by 8 ft with a depth of 3 inches contains about 40 cubic feet before allowance.

With a 5% allowance, the project requires approximately 42 cubic feet, or about 1.56 cubic yards.

Common Bag Sizes

Bag sizes vary, but 2 ft³ and 3 ft³ bags are common. The calculator shows how many bags would be required using each size.

Frequently Asked Questions

How many cubic feet are in one cubic yard?

One cubic yard contains 27 cubic feet.

How many 2 ft³ bags are in one cubic yard?

One cubic yard equals 13.5 bags of 2 ft³, so purchasing requires rounding up.

Does mulch settle?

Yes. Some materials compress or settle after installation, which can affect the finished depth.

Planning estimate: Bag volume, settling and finished depth can vary by product.

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