Construction/Home calculator
Stair Rise-and-Run Calculator
Estimate riser count and total stair run from rise, riser height, and tread run.
Formula
Stair layout estimate
Always check local building codes for stair dimensions, landings, and handrails.
Risers = ceil(total rise / preferred riser height); run = (risers - 1) x tread depth
108 inches total rise at 7.5 inches gives 15 risers.
FAQs
Should stairs meet local code?+
Yes. Always check local building rules for riser height, tread depth, and handrail requirements.
How does the Stair Rise-and-Run Calculator calculate the result?+
It uses the Stair layout estimate: Risers = ceil(total rise / preferred riser height); run = (risers - 1) x tread depth. 108 inches total rise at 7.5 inches gives 15 risers.
What information do I need to use the Stair Rise-and-Run Calculator?+
Estimate riser count and total stair run from rise, riser height, and tread run.
How accurate is the Stair Rise-and-Run Calculator?+
Stair Rise-and-Run Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Stair Rise-and-Run Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Construction/Home guide
How to use the Stair Rise-and-Run Calculator
Estimate riser count and total stair run from rise, riser height, and tread run. The page also explains the stair layout estimate and shows a practical example: 108 inches total rise at 7.5 inches gives 15 risers.
- 1
Enter your details
Enter rise, riser height, and tread run, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the stair layout estimate: Risers = ceil(total rise / preferred riser height); run = (risers - 1) x tread depth.
- 3
Compare scenarios
Change one or more inputs to see how they affect the stair Rise-and-Run Calculator result before you use the estimate.
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