Home & Construction
Stair Calculator
Calculate stair dimensions and materials
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Stair Calculator do?
It helps you calculate stair dimensions and materials.
What inputs do I need?
Enter Total rise, Total run, and Target riser height.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
This Stair Calculator turns your inputs into practical results. Provide Target riser height, Total rise, and Total run to calculate Actual riser height and Steps.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.