How much carpet for 13 stairs?
Estimate each tread+riser as roughly 2 sq ft per step (varies by overhang). 13 stairs ≈ 26 sq ft per foot of width — a 3 ft wide run needs ~78 sq ft plus 15% waste ≈ 10 sq yd.
Stair Carpet Calculator
Stair carpet is ordered in square yards like room carpet. Measure each flight as length × width (tread depth × stair width) or add individual stair "rooms" — default waste is 15% for cuts and wrapping.
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Default 15%
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Related guides
Frequently asked questions
How much extra waste for stairs?
Use 15–20% waste for stairs vs 10% for flat rooms. Bullnose, winders, and pattern matching consume more material.
Do I need pad on stairs?
Yes — use thin, dense stair pad or the pad recommended by your carpet manufacturer. Order pad in the same square yards as carpet.
Related calculators
Flooring Box Calculator · https://flooringboxcalculator.com/stair-carpet-calculator/