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Stair Runner Length and Waste Calculator
A stair runner travels across every tread and down every riser, so horizontal floor distance alone understates material. Add top and bottom termination allowances, then round to full pattern repeats before applying installation waste. This calculator covers a straight flight; winders, landings, upholstered noses, and installation method need separate measurement.
Planning estimate only. Check measurements and real-world constraints before buying materials or making a commitment.
Calculate your scenario
Change any input. Results update immediately.
Your results
Runner length to purchase
8.10 yd
After pattern-repeat rounding and waste.
Raw covered path
22.00 ft
Treads, risers, and end allowances.
Pattern-rounded length
22.50 ft
Before installation waste.
How the calculation works
The calculator applies this relationship to the inputs above. Keep every measurement in the unit shown.
Worked example
Use this example to check the calculator by hand before relying on a result.
Assumptions behind the result
- • Stair flight is straight.
- • Every tread and riser uses the entered dimensions.
- • End allowance is total for both ends.
- • Repeat matching starts from a usable motif position.
- • Installer confirms the final cut plan.
Mistakes that change the answer
- • Measuring floor projection only.
- • Ignoring the stair nose path.
- • Adding repeat allowance after ordering.