How it works
Multiply the area in square feet by the depth in feet (inches ÷ 12) to get cubic feet. Divide by 27 to get cubic yards, which is how bulk mulch is sold. For bags, divide the cubic feet by the bag size and round up.
Cubic yards = length (ft) × width (ft) × depth (in) ÷ 12 ÷ 27
Mulch coverage chart
| Depth | 1 cubic yard covers | One 2 cu ft bag covers |
|---|---|---|
| 1 in | 324 sq ft | 24 sq ft |
| 2 in | 162 sq ft | 12 sq ft |
| 3 in | 108 sq ft | 8 sq ft |
| 4 in | 81 sq ft | 6 sq ft |
| 6 in | 54 sq ft | 4 sq ft |
Worked example
A 20 × 10 ft bed at 3 inches deep is 200 sq ft × 0.25 ft = 50 cubic feet = 1.85 cubic yards, or 25 bags of 2 cu ft. A round bed 8 ft across at 3 inches is 12.6 cubic feet, or 7 bags.
Frequently asked questions
How many bags of mulch are in a yard?
13.5 bags of 2 cubic feet, or 9 bags of 3 cubic feet. A cubic yard is 27 cubic feet.
How deep should mulch be?
2 to 4 inches. Use about 3 inches for new beds and 1 to 2 inches to top up old mulch. Keep it a few inches away from tree trunks and stems.
How much area does a yard of mulch cover?
About 108 sq ft at 3 inches deep, 162 sq ft at 2 inches, and 324 sq ft at 1 inch.
Is bulk or bagged mulch cheaper?
For more than about 2 cubic yards, bulk delivery is usually cheaper. Bags are easier for small jobs.