How much mulch for 400 square feet?
At 3 inches deep, 400 square feet needs 3.70 cubic yards of mulch, or about 50 bags (2 cu ft each).
2 to 3 inches is right for most beds; 4 inches for paths or heavy weed pressure.
| Depth | Cubic yards | 2 cu ft bags | 3 cu ft bags |
|---|---|---|---|
| 2 in | 2.47 | 34 | 23 |
| 3 in | 3.70 | 50 | 34 |
| 4 in | 4.94 | 67 | 45 |
1 cubic yard = 27 cubic feet. Bulk delivery is usually cheaper than bags above about 1 to 2 cubic yards.