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Area to cover
Depth and material
Material density

Typical for loose fill dirt (about 1 ton per cubic yard); it settles, so the default adds 15% extra.

Cost (optional)

You need

8.52 cubic yards

≈ 8.52 tons · 230 cubic feet · includes 15% extra

20 ft20 ftdepth6 in
Area400 sq ft
Cubic feet230
Cubic yards8.52
Cubic meters6.51
Tons (US)8.52
Pounds17,037

Bags

1 cu ft bag230

Cubic yards = area (sq ft) × depth (ft) × (1 + 15%) ÷ 27 · Tons = cubic yards × 2,000 lb ÷ 2,000