Stair Calculator
Enter total rise and preferred riser to compute the number of steps, actual riser height and total horizontal run.
Input Data
Results
14
7.71
130
At a glance:Steps = round(total rise ÷ preferred riser), at least 1; actual riser = total rise ÷ steps; total run = (steps − 1) × tread depth.
Formula
steps = max(1, round(totalRise ÷ prefRiser)).
actualRiser = totalRise ÷ steps.
totalRun = (steps − 1) × treadDepth.
How to Use
- Enter total vertical rise and preferred riser (in).
- Enter tread depth to get steps, actual riser and run.
FAQ
What riser height is allowed?
Common residential guidance keeps riser ≤ ~7.75 in (≈197 mm) and tread ≥ ~10 in for safety and comfort.
Why round steps to whole numbers?
Step count must be an integer; the calculator rounds then back-computes the actual riser so every step is equal height.
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References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.