How much topsoil for 50 square feet?
At 4 inches deep, 50 square feet needs 0.62 cubic yards of topsoil, or about 23 bags (0.75 cu ft (40 lb) each).
Topsoil weighs about 1.1 tons per cubic yard, more when wet.
| Depth | Cubic yards | 0.75 cu ft (40 lb) bags | 1 cu ft bags | Tons |
|---|---|---|---|---|
| 2 in | 0.31 | 12 | 9 | 0.34 |
| 4 in | 0.62 | 23 | 17 | 0.68 |
| 6 in | 0.93 | 34 | 25 | 1.02 |
1 cubic yard = 27 cubic feet. Bulk delivery is usually cheaper than bags above about 1 to 2 cubic yards.