Estimate bulk mulch, 2 and 3 cubic foot bags, coverage area, and overage for wood chips, shredded bark, or rubber mulch.
Quick answer: Multiply bed length × width × mulch depth in feet and divide by 27. A 200 sq ft bed at 3 inches deep needs (200 × 0.25) / 27 = 1.85 cubic yards — about 25 bags of 2 cu ft mulch, or 27 to 28 bags with 10 percent overage.
Ballpark, not gospel. This estimates volume and bags from the numbers you punch in — check bag sizes on the label and confirm bulk pricing with your supplier before ordering.
| Depth | Area covered by 1 cubic yard | Common use |
|---|---|---|
| 1 inch | 324 sq ft | Topdressing, thin mulch refresh |
| 2 inches | 162 sq ft | Refreshing existing beds |
| 3 inches | 108 sq ft | New mulch beds |
| 4 inches | 81 sq ft | Heavy weed control |
Straight answers, no fluff. Then run your own numbers above.
Multiply bed length by width by mulch depth in feet, then divide by 27. A 3 inch depth is 0.25 feet.
Most beds use 2 to 3 inches of mulch. Use 4 inches only where extra weed control or moisture protection is needed.
There are 13.5 bags of 2 cubic feet in 1 cubic yard. Round up to 14 bags for ordering.
Bulk mulch is often cheaper for larger areas. Bags are convenient for small beds, repairs, and areas without easy delivery access.
One cubic yard covers about 162 square feet at 2 inches deep. At 3 inches it covers 108 square feet, and at 4 inches it covers 81 square feet.
At 3 inches deep, 100 sq ft needs about 0.93 cubic yards, or roughly 13 bags of 2 cu ft mulch. Round up to 14 bags, or 15 to 16 with overage.
Deep dive: How much mulch do I need? (bags vs bulk) — or convert area-only estimates with the square-feet converter.