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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.
about 71 cubic metres of gravel i think
it depends how thickly you lay it.
16 cubic yards
23 cu. ft., or about 1 cu. yd.