You cant. Cubic feet has an extra dimension. Square feet=lengthxwidth Cubic feet=Lengthxwidthxheight i dont know if this is reliable or not... http://www.onlineconversion.com/faq_01.htm This is a nonsensical question. You must specify the Depth to which you are spreading material over the 64 sq ft. For example, 21.3 cu ft can be spread to a depth of 4 inches over 64 sq ft. Example calculation: 64 sq ft x(4/12) ft = 21.3 cu ft
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