Divide by 9.81
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A tonne is a unit of mass; a square meter is a unit of area. You only "convert" units of the same kind.
None. "square meter" is a unit of volume and "ton" is a unit of mass.
To convert cubic meters of asphalt to tons, you need to know the density of the asphalt, which typically ranges from about 2,200 to 2,400 kg/m³. Multiply the volume in cubic meters by the density to get the mass in kilograms, then divide by 1,000 to convert to tons. For example, if the density is 2,300 kg/m³, then 1 cubic meter of asphalt would equal approximately 2.3 tons.
You cannot use a measure of area to calculate its weight.You need a third dimension to first calculate the volume and then convert to weight by knowing the density of the soil.If you have a depth of one meter there is one cubic meter and soil has a density of about 1,3 so your cubic meter of soil weighs 1,3 tonnes.
3096 sq yds by 9 in thick is a volume of 774 sq yards.To convert that to a weight in tons, multiple it by the density of the substance in tons per square yard.