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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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How much is 500 meters squared in inches squared?
500 m2 = 775,001.55 inches squared.
How much area will a cubic yard of gravel fill?
it depends how thickly you lay it.
How much gravel do you need to fill 255 square feet 3 inches deep?
about 71 cubic metres of gravel i think
How much gravel to fill a 6' x 6' x 4' hole?
16 cubic yards
Why are the units for volume and surface area raised to different powers?
Surface area is the sum of the areas of all the surfaces of an object. When you add units, they stay the same. Since you are adding, let's say, meters squared and meters squared and meters squared, your unit is still meters squared. Volume is a measure of how much space is inside an object. To find volume, you must multiply length, width, and height. In our example, that would be meters x meters x meters. When you multiply units, they multiply to each other. So, we get meters cubed, or meters^3.
