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Stair Calculator

Stair rise, run and stringer.

Stair stringer

Number of steps
15
Riser height
7.20 in
Within IRC residential range (6–7¾ in)
Tread depth
10.60 in
2R + T = 25 rule · IRC requires ≥ 10 in
Stringer length
183.54 in
15.29 ft · slope 36°
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Stair Calculator · Generated 5/2/2026 · calccenter.online/calculators/other/stair

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About the Stair Calculator

MethodologyHome

Stair rise, run and stringer. Use this free stair calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this Stair Calculator do?

Stair rise, run and stringer.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.