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about 71 cubic metres of gravel i think
You will need about 463 cubic yards (around 594 tons) of gravel for this area.
You'll need about 28.704 cubic yards (37 tons) of gravel.
I need to know how thick the layer of gravel is meant to be.
1 square foot = 144 square inches, so 100 square ft = 14400 sq inches. Multiply be 3 = 43200 cubic inches. I believe gravel is normally sold by the cubic yard. 1 cubic yard = (36 in)3 = 46656 cubic inches. So 43200/46656 = 0.926 cubic yards