Carpet Calculator

Calculate carpet area in square yards, the standard purchasing unit, with a waste allowance for seams and trimming.

Square Yards
— sq yds
Standard carpet purchasing unit.

Usage Tip

For rooms wider than 12 feet, plan seams away from high-traffic paths and run the pile toward the main window light.

THE MATH
area = length × width
with waste = area × (1 + waste ÷ 100)
square yards = with waste ÷ 9
Carpet is sold by the square yard, but rooms are measured in feet, so the area is converted at 9 square feet per square yard.
A waste allowance covers seams, trimming, and pattern matching.
Enter the room length and width in feet and a waste percentage (10 percent is typical).
Carpet usually comes in 12-foot-wide rolls, so wide rooms may need extra for seams.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.