Gravel for a 30×40 Area at 4" Deep
Covering a 30×40 area 4 inches deep takes about 20.0 tons of gravel (14.81 cubic yards). Change the size or depth below — driveways usually run 4–6".
Gravel needed
20.0 tons
Area
1,200 sq ftat 4" deep
Gravel needed
20.0 tons14.81 cubic yards
Delivered cost (est.)
$900~$45/ton crushed gravel
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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.