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Stair Calculator

Estimate riser count, tread count, horizontal run, and stringer length.

in
in
in
in
Risers
15
7.2 in each
Treads14
Total horizontal run140 in (11.67 ft)
Approx. stringer length176.8 in
Stair width36 in
Comfort check (2R + T)24.4 in

This is a layout estimate, not a building-code determination. Verify riser, tread, landing, handrail, and headroom requirements with local codes.

About the Stair Calculator

Estimate riser count, tread count, horizontal run, and stringer length.

It runs entirely in your browser — nothing you type is sent to a server — and the result updates as you edit the inputs. Estimates are for educational and informational purposes only; see ourdisclaimer.

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