Gravel for a 30×40 area at 4" deep
A 30 ft × 40 ft area filled 4 inches deep with gravel needs the amounts below.
Gravel needed
14.81cubic yards
400
cubic feet
20.7
tons (approx)
200
2 ft³ bags
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Different size, depth, or material? Use the full gravel calculator for gravel, sand, topsoil, or mulch.
For an area this size, bulk delivery by the cubic yard is usually far cheaper than bags — about 20.7 tons.