Stair Calculator

Enter total rise and a target riser height to lay out basic stair geometry.

Total rise

Rise unit

Target riser height (in)

Tread depth / run (in)

—Risers

—Actual riser

—Treads

—Total run

—Basic stair geometry

Geometry estimate only. Stair dimensions, landings, handrails, headroom, stringer capacity, and allowable riser/tread sizes are governed by local building codes.

How to use this Stair Calculator

Calculate stair risers, tread count, total run, and stringer length from total rise. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.