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Area to cover
Depth and material
Material density

Typical for shredded wood mulch (400–800 lb per cubic yard, depending on moisture).

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You need

0.78 cubic yards

≈ 0.31 tons · 21 cubic feet · includes 5% extra

20 ft4 ftdepth3 in
Area80 sq ft
Cubic feet21
Cubic yards0.78
Cubic meters0.59
Tons (US)0.31
Pounds622

Bags

2 cu ft bag11
3 cu ft bag7

Cubic yards = area (sq ft) × depth (ft) × (1 + 5%) ÷ 27 · Tons = cubic yards × 800 lb ÷ 2,000