Updated Construction & Carpentry

Stair Calculator

Estimate stair rise, run, riser height, tread depth, stair angle, stringer length and material needs with automatic code-style or custom riser settings.

Rise & Run Geometry Riser & Tread Layout Stringer & Material Planning

Stair Geometry, Stringer Length & Material Estimator

Main field = feet or meters, extra field = inches or centimeters.
Choose automatic, code-style riser control or set a preferred riser height.
Common residential guideline: ≤ 7.75 in (check your local code).
Typical minimum tread depth: 10 in or more.
Used when “Custom Preferred Riser Height” is selected.
Vertical distance from finished floor below to finished floor above.
In inches if using feet, in centimeters if using meters. Leave as minimum if unsure.
Clear stair width to help estimate stringers and materials.

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