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Stairs calculator built for real job-site layouts

HammerCalc’s stairs calculator turns rise, run and headroom into a clear layout with interactive sliders and a live diagram — so you cut stringers with confidence, not guesswork.

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What this stairs calculator does

Open the Stair tool in HammerCalc and dial in total rise, desired riser height, and tread depth. The app updates rise count, run, stringer length and headroom as you move the sliders — with a visual diagram that matches how stairs actually go together on site.

  • Interactive rise / run / stringer math with live diagrams
  • Adjust risers and treads visually instead of juggling formulas
  • Built for carpenters, framers and remodelers who layout stairs every week
  • Works alongside feet-inch-fraction math and mixed metric/imperial units

Why builders use HammerCalc as their stair calculator

Most “stair calculators” are web forms or dense keypad apps. HammerCalc is a full construction calculator app with a dedicated visual stairs tool — plus the everyday feet, inches and fraction keypad you already need on the job.

How to calculate stair rise and run (formula)

Riser count ≈ round(total_rise ÷ target_unit_rise). Then unit_rise = total_rise ÷ risers. Number of treads is usually risers − 1. Total run ≈ treads × unit_run. Stringer length ≈ √(total_rise² + total_run²).

Stringer ≈ √(rise² + run²) · Example: √(105² + 130²) ≈ 167.1 in (~13 ft 11-1/8 in)

Worked example: stair stringer layout

A practical stair stringer calculator check before you cut:

  • Given: Total rise 105 in, target riser ~7.5 in, tread depth 10 in
  • Risers / run: 14 risers → unit rise 7.5 in; 13 treads → total run 130 in
  • Stringer: √(105² + 130²) ≈ 167.1 in

FAQ

Is HammerCalc a good stairs calculator for iPhone?

Yes. The stair tool is built for iPhone, iPad and Mac with interactive sliders and diagrams for rise, run and stringer length.

Can I use it for stringer layout?

Yes. HammerCalc’s stairs calculator is designed for practical stringer and stair layout math on the job site.

How do I calculate rise and run for stairs?

Divide total rise by a comfortable unit rise (often ~7–7.75 in) to get riser count, set tread depth for unit run, then use √(total rise² + total run²) for approximate stringer length.

Is HammerCalc a staircase calculator for iPhone?

Yes. The stairs tool is built for iPhone, iPad, and Mac with interactive sliders for rise, run, stringer length, and headroom.

Get this tool on your iPhone, iPad & Mac

Stairs, square footage, feet & inches, metric & imperial — all in HammerCalc.

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