How Much Topsoil for 400 Square Feet?
Spreading topsoil over 400 sq ft at 2 inches takes 2.47 cubic yards — about 89 bags, or much cheaper in bulk. Adjust below for a new lawn (4–6") vs top-dressing (1–2").
Topsoil needed
2.47 cu yd
Area
400 sq ftat 2" deep
Topsoil needed
2.47 cubic yards67 cubic feet
0.75-cu-ft bags
89 bagsbulk is far cheaper above ~1 CY
Bulk cost (est.)
$86~$35/CY delivered vs $312 bagged
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How this is calculated
Mulch volume = bed area × depth. We convert cubic feet to cubic yards for bulk delivery and to 2-cu-ft bags for the bagged option, so you can compare cost both ways.