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Topsoil for 400 sq ft
Topsoil for 400 ft² at 4 in deep · 178 × 0.75 ft³ bag
Topsoil for 400 ft² by depth
| Depth | yd³ | ft³ | Bags | Tons | Bulk / bagged cost |
|---|---|---|---|---|---|
| 2 in | 2.47 | 66.7 | 89 | 2.72 | $86 / $312 |
| 4 in | 4.94 | 133.3 | 178 | 5.43 | $173 / $623 |
| 6 in | 7.41 | 200.0 | 267 | 8.15 | $259 / $934 |
| 8 in | 9.88 | 266.7 | 356 | 10.86 | $346 / $1,246 |
Use 2 in to top-dress a lawn, 4–6 in for new lawns and 6–12 in for raised or new garden beds. Loose topsoil settles about 10–20%.
How it is calculated
Volume = area × depth: 400 ft² × (4 ÷ 12) ft = 133.3 ft³; ÷ 27 = 4.94 yd³. 400 ft² is, for example, a 20.0 × 20.0 ft square or a 40 × 10 ft strip.
FAQ
How much topsoil do I need for 400 square feet?
At 4 in deep, 400 ft² needs 4.94 cubic yards (133.3 ft³) – about 178 × 0.75 ft³ bag. That weighs roughly 5.4 tons.
Is it cheaper to buy topsoil in bulk or bags for 400 sq ft?
At typical prices ($35/yd³ bulk vs $3.50 per bag) bulk costs about $173 versus $623 in bags, before delivery. Bulk delivery usually wins above about 1 cubic yard.
Other areas: 200 ft² · 250 ft² · 300 ft² · 500 ft² · 600 ft² · 750 ft² · all areas · topsoil calculator
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