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It depends how thin the cubic feet are. If they are 1 foot thick: 21,000 cubic feet. If they are 3 feet thick: 63,000 cubic feet will cover 21,000 square feet.

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14y ago
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9y ago

This is not a correct conversion. Cubic feet is a measure of volume while square feet is a measure of area.

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14y ago

Only about 36, if it's only 1/4 inch deep.

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Q: How many cubic feet do I need to cover 21000 square feet?
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22.6 square feet.


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CONVERSION CHART1 Cubic yard 1 inch deep will cover 324 Square feet1 Cubic yard 2 inch deep will cover 162 Square feet1 Cubic yard 3 inch deep will cover 108 Square feet1 Cubic yard 4 inch deep will cover 81 Square feet1 Cubic yard 5 inch deep will cover 64 Square feet1 Cubic yard 6 inch deep will cover 54 Square feet(Length in Feet)( Width in Feet)*(Depth in Feet)=cubic feetExample: Say you have an area that is 12' x 18 '. You want to cover it with 6" of material.Multiply, 12' x 18' x *.5' to get 108 cubic feet. You see, 6" is .5 feet or 1/2 a foot.Now, devide 108 cubic feet by 27 cubic feet(1 yard) to get your total yardage at 4 yards.If you want a 3" cover you use 1/4' or .25'. A four inch cover is 1/3 foot or .33', etc.OR ---- Multiply your square footage by .003 for 1" coverage.0061 for a 2" coverage .0092 for a 3" coverage and.0123 for a 4" coverage. It takes 12.3 cubic yards of top soil to cover 1,000 square feet at 4". Hope this helps. ----