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Stair Calculator
Calculate stair stringer length, rise, run, and step dimensions
How It Works
Design stairs by calculating the number of steps, stringer length, actual rise/run, and pitch angle.
A stair calculator helps architects, builders, and DIY enthusiasts design safe and comfortable stairs. The key dimensions are the total rise (vertical distance between floors) and total run (horizontal distance the stairs will span).
The calculator determines the optimal number of steps based on a desired riser height, then computes the actual rise and run per step. The stringer length (the diagonal board that supports the steps) is calculated using the Pythagorean theorem.
Most building codes recommend a riser height between 4 and 7.75 inches and a tread depth (run) of at least 10 inches. The 2R + G formula (2 × rise + run) should ideally fall between 24 and 25 inches for comfortable stairs. Always check local building codes before construction.
Results
Enter values to see results
Quick Tips
- • Results update automatically as you type
- • Use Tab to navigate between fields
- • Press Enter to calculate