Calculators for this trade
Stair Calculators
Use this section for rise/run layout, stringer geometry, deck stair material planning, stair baluster spacing, and handrail angle checks. These are estimating tools, not replacements for local code review.
5 free tools. No signup, no paywall. Just fixed formulas, waste allowances, and jobsite notes you can check.
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Start with the stairs job you are checking, then open the calculator that matches your measurement. Related tools stay together, from quick layout checks to material counts and early cost estimates.
Stairs calculators
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Stair Stringer Calculator
Riser count, riser height, tread depth, total run, and stringer cut length, with code checks.
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Stair Handrail Angle Calculator
Calculate stair handrail angle, rail pitch, diagonal rail length, slope length, and pitch ratio.
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Stair Baluster Spacing Calculator
Calculate stair spindle count, equal sloped-rail opening, rail angle, waste, and rough spindle cost from rise and run.
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Deck Stair Calculator
Estimate deck stair step count, actual riser height, total run, stringer length, stringers, treads, and cost.
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Stair Tread Calculator
Estimate stair tread board count, stair width cut length, stock board length, waste, and rough material cost.
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