Stair Tread Calculator
Calculate the optimal stair tread dimensions based on total rise, number of steps, and desired tread depth. Includes building code compliance check.
Published by:
isCalculator Editorial Team
Reviewed by:
Review Board
Last Updated:
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How to use this tool?
How to Use the Stair Tread Calculator
- Enter Total Rise – Input the total vertical height of the staircase in inches (e.g., 108). This is the distance from the finished floor below to the finished floor above.
- Enter Number of Steps – Provide the total number of steps (risers) you plan to have (e.g., 14). Must be a whole number.
- Enter Desired Tread Depth – Input the horizontal depth of each step in inches (e.g., 10). This is the depth without any nosing overhang.
- Enter Nosing Overhang (optional) – If your treads have a nosing (overhang beyond the riser), enter that value in inches (e.g., 1). Leave as 0 if none.
- Click "Calculate" – The calculator will compute:
- Riser Height = Total Rise ÷ Number of Steps
- Actual Tread Depth = Desired Tread Depth + Nosing
- Review Results – The output shows the riser height and actual tread depth. A compliance message indicates if these values fall within typical building code ranges (riser: 4–7.75 in, tread: 10–11 in).
- Check Calculation Steps – A step-by-step breakdown is provided for transparency.
Note: All measurements are in inches (imperial). Ensure inputs are positive numbers.
Previous Results
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Frequently Asked Questions
Typical building codes require riser heights between 4 and 7.75 inches.
Minimum tread depth is usually 10 inches, but local codes may vary.
Yes, nosing adds to the tread depth. The actual tread depth is the sum of the tread run and the nosing overhang.