 Quandaries and Queries Name: Mike Who is asking: Parent Level of the question: All Question: I need to know how to calculate square feet into yards of material. Example: 1320 sq. ft. surface area by 1 in. depth. What does this equal in cubic feet and yards. Thanks for any help you can give me. Mike, One foot is twelve inches so 1 inch is 1/12 feet. Thus 1320 sq ft by 1 inch is 1320 sq ft 1/12 ft = 110 cubic feet. If this piece of land was 30 ft by 44 ft by 1 inch then you could change all the dimensions to yards. 30 ft is 30/3 yards 44 ft is 44/3 yards  1/12 ft is 1/12 1/3 = 1/36 yards Thus the volume is  30/3 44/3 1/36 = 1320/9 1/36 = 4.07 cubic yards. What you should see in the line above is that I divided 1320 by 9, that is 3 3, to convert the square feet to square yards, and then multiplied by the third dimension, in yards, to get the volume in cubic yards. I did this with the assumption that the 1320 sq ft was a rectangle, 30 ft by 44 ft, but that assumption wasn't necessary. Regardless of the shape of the land that gave 1320 square feet, you need to divide by 9 to convert the units to square yards, and then multiply by the depth in yards. Penny   