Construction/Home calculator

Stair Rise-and-Run Calculator

Estimate riser count and total stair run from rise, riser height, and tread run.

FormulaRisers = ceil(total rise / preferred riser height); run = (risers - 1) x tread depth

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.

FAQ5 common questions for this calculator.

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?+

For the Stair Rise-and-Run Calculator, 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?+

For the Stair Rise-and-Run Calculator, enter rise, riser height, and tread run. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the Stair Rise-and-Run Calculator?+

Stair Rise-and-Run Calculator is a material estimate based on the dimensions, unit system, and allowance values entered. It uses the Stair layout estimate, but cuts, openings, site conditions, pack sizes, and code requirements can change the final quantity.

What should I check before using the Stair Rise-and-Run Calculator result?+

For the Stair Rise-and-Run Calculator, check rise, riser height, and tread run, unit system, waste allowance, openings, site conditions, and supplier pack size. Use the estimate as a planning quantity before ordering materials.

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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. 1

    Enter your details

    Enter rise, riser height, and tread run, then complete any other fields shown in the calculator.

  2. 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. 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.