Measure and record the diameter of the entire roll of carpet in inches.
Measure and record the diameter of the hole in the center of the carpet roll in inches.
Measure and record the thickness of the carpet in inches.
Find the area of the entire roll of carpet. Separately, find the area of the hole in the center of the roll. Use the mathematical equation that allows you to find the area of the carpet to figure out these numbers. This equation for area is Pi times r^2. Pi is equal to approximately 3.14. The letter "r" symbolizes the radius. The radius is exactly half of the diameter.
Find the adjusted area of the carpet. Subtract the area of the hole from the area of the entire carpet.
Divide the adjusted area by the thickness measurement to find the linear length of the carpet. Divide the linear length in inches by 12 to get linear feet.
Measure and record the width of the carpet on the outside of the roll in feet. Multiply the linear feet by the width measurement to get the final square feet measurement.
Convert square feet into square yards if necessary. To do this, divide the square footage figure by 9.
Repeat all the steps for any remaining rolls of carpet. Do not assume all rolls are the same size.
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