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Gravel is bought in cubic quantities, or by weight.

You ask "to fill" but you only give a square measure. The volume of gravel required wil depends on the depth you wish the gravel to be.

To fill 81 square metres to a depth of 5 cm would require 4.05 cubic metres of material.

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14y ago

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Q: How much gravel to fill 81 meters squared?
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