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Mulch calculator / Mulch coverage per bag

Bag coverage by depth

How Much Does a Bag of Mulch Cover?

Need at least one cubic yard (27 ft³)? Use 14 whole 2-ft³ bags (13.5 rounds up) or 9 whole 3-ft³ bags. See the full bag-size table.

One 2-cubic-foot bag covers 8 square feet at 3 inches deep. At 2 inches it covers 12 square feet; at 4 inches, 6 square feet. All figures assume a uniform layer before allowance.

Read your bag’s printed volume and compare depths below. For a measured bed, calculate whole bags.

Mulch Coverage per Bag by Depth

Compare the volume printed on your bag at your chosen depth.

Estimated area for one bag with the listed volume, before any extra material
Depth 1.5 ft³ bag 2 ft³ bag 3 ft³ bag
1 inch18 sq ft24 sq ft36 sq ft
2 inches9 sq ft12 sq ft18 sq ft
3 inches6 sq ft8 sq ft12 sq ft
4 inches4.5 sq ft6 sq ft9 sq ft

For a uniform layer, square feet per bag = bag volume in cubic feet × 12 ÷ depth in inches. The volumes below are calculation examples; use the exact volume printed on your package. If your package gives coverage area at a stated depth instead of cubic volume, use the mulch bag coverage calculator to convert that label basis for your measured beds.

Planning note: Coverage is a volume calculation, not a depth recommendation or supplier quote. Check the package label and use the depth appropriate for your project.

These are arithmetic estimates at a uniform depth, not a product catalog. For a measured project, enter your area and bag size in the mulch calculator. The area × depth and bag-volume method is described by Iowa State University Extension.

A two-cubic-foot example bag covers 12 square feet at two inches, 8 at three inches, or 6 at four inches; coverage decreases as depth increases.
The same example 2 ft³ bag covers less ground at a deeper, uniform layer. These depths illustrate the calculation, not a recommendation.

One cubic yard = 27 cubic feet

Bags per cubic yard by bag size

Whole bags needed for 27 cubic feet, rounded up
Bag volume Calculation Whole bags
0.5 ft³27 ÷ 0.5 = 5454 bags
1 ft³27 ÷ 1 = 2727 bags
1.5 ft³27 ÷ 1.5 = 1818 bags
2 ft³27 ÷ 2 = 13.514 bags
2.5 ft³27 ÷ 2.5 = 10.811 bags
3 ft³27 ÷ 3 = 99 bags

Formula: whole bags = ceiling(27 ÷ bag volume in cubic feet). A partial bag cannot cover a full cubic yard, so the result is rounded up.

One cubic yard is 27 cubic feet. At 2 cubic feet per bag, 13 and a half bag volumes are needed, so buy 14 whole bags; the last bag has 1 cubic foot beyond the measured target.
For the example 2 ft³ bag, 27 ÷ 2 = 13.5 bag volumes. Fourteen whole bags contain 28 ft³; the extra 1 ft³ comes from rounding, not a project allowance.

Metric package reference

Example liter bag volumes per cubic yard or cubic meter

Whole metric bags rounded up for two bulk volume references
Printed bag volume1 cubic yard (764.555 L)1 cubic meter (1,000 L)
40 L20 bags25 bags
42.5 L18 bags24 bags
50 L16 bags20 bags
60 L13 bags17 bags

Formula: whole bags = ceiling(reference volume in liters ÷ printed liters per bag). One cubic yard is 764.555 liters when rounded to three decimals, calculated from 27 cubic feet and NIST's exact international-foot conversion (1 ft = 0.3048 m; NIST conversion factors).

Use the package volume printed for the exact product; a product name does not guarantee one standard bag size. For a measured project, enter the bag size in the mulch calculator, or calculate mulch litres and whole metric bags. If material remains in the bed, first calculate the new layer with the mulch top-up calculator.

Common questions

Mulch coverage per bag FAQ

Is one cubic yard always 27 cubic feet?

Yes. A cubic yard is a volume unit equal to 3 ft × 3 ft × 3 ft, or 27 cubic feet.

How much area does one cubic yard of mulch cover?

At a uniform 3-inch layer, one cubic yard (27 cubic feet) covers 108 square feet before project allowances. For other depths, see the cubic-yard coverage chart.

Why does a 2-cubic-foot bag count as 14 bags?

One cubic yard is 27 cubic feet. 27 ÷ 2 = 13.5, and a partial bag cannot be purchased as a complete bag, so the count rounds up to 14.

Should I add extra bags?

Only if your site conditions or supplier guidance call for an allowance. Keep the measured quantity separate from any extra amount so the basis stays clear.

How much coverage does a 2-cubic-foot bag of mulch provide?

Coverage depends on depth. One 2-cubic-foot bag covers about 12 square feet at 2 inches deep, 8 square feet at 3 inches, or 6 square feet at 4 inches before any project allowance.

Is there a standard bag size for mulch?

Use the cubic-foot or liter volume printed on the exact package. The sizes in this chart are calculation examples, not a complete product list.

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