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1m3=35.5 ft3 1m3=0.0355 mscf
The more gravel you have, the more it weighs.
one meter is 100 centermeters 1m3 is 1,000,000cm3
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.
To convert cubic meters (m^3) to kilograms (kg), you need to know the density of the substance in question. The formula for this conversion is: mass (kg) = volume (m^3) x density (kg/m^3). So, if you have the density of the substance, you can multiply the volume in cubic meters by the density to get the mass in kilograms.