Stair Calculator
Calculate the number of steps, riser height, tread depth, and total run for a staircase based on total rise and desired riser height or tread depth.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator helps you design stairs by determining the number of steps, actual riser height, total run, and stringer length based on your total rise and desired step dimensions.
- Enter Total Rise (inches): Measure the vertical distance from the finished floor below to the finished floor above. Input this value in inches.
- Enter Desired Riser Height (inches): Input your preferred height for each step (typically 7-8 inches).
- Enter Desired Tread Depth (inches): Input the depth of each step (typically 10-11 inches).
- Click "Calculate": Press the button or hit Enter.
- Number of Steps: The total number of risers (rounded up).
- Riser Height: The actual riser height after rounding (total rise ÷ number of steps).
- Tread Depth: Your entered tread depth (unchanged).
- Total Run: Horizontal distance covered by the stairs (steps minus one, times tread depth).
- Stringer Length: The diagonal length of the stair stringer (calculated via Pythagorean theorem).
Outputs explained:
Note: All inputs and outputs are in inches (imperial units). Ensure positive values for all fields.
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Frequently Asked Questions
The ideal riser height is between 4 and 7.5 inches, with 7 inches being common for residential stairs.
Total rise is the vertical distance from the finished floor below to the finished floor above.
Building codes typically require a minimum tread depth of 10 inches, but 11 inches is recommended for comfort.