How Much Topsoil for 100 Square Feet?
Spreading topsoil over 100 sq ft at 4 inches takes 1.23 cubic yards — about 45 bags, or much cheaper in bulk. Adjust below for a new lawn (4–6") vs top-dressing (1–2").
Topsoil needed
1.23 cu yd
Area
100 sq ftat 4" deep
Topsoil needed
1.23 cubic yards33 cubic feet
0.75-cu-ft bags
45 bagsbulk is far cheaper above ~1 CY
Bulk cost (est.)
$43~$35/CY delivered vs $158 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.