Free Stair Calculators for Builders & DIYers

Stringers, rise & run, deck stairs, concrete, spiral, railings, and more. All free, all in your browser.

Stringer CalculatorDeck Stair Calculator
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📐Code Compliant
📊Interactive Diagrams
🆓Always Free
📱Works on Mobile

Popular Calculators

Our most-used stair tools

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Stair Stringer Calculator

Calculate stringer dimensions: total rise, number of steps, rise per step, run per step, stringer length, and cut angle. Includes an interactive SVG diagram.

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Deck Stair Calculator

Calculate deck stairs from deck height. Get step count, rise, run, stringer length, and landing requirements for deck construction.

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Rise & Run Calculator

Calculate optimal rise and run from total height and horizontal space. Shows IRC 2018 code compliance for residential stairs.

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Stair Diagram Generator

Generate detailed, printable stair diagrams with all measurements. Side view, stringer template, and dimension labels.

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All Calculators

Browse our complete toolkit

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Stair Tread Calculator

Calculate tread depth, nosing overhang, and total tread material needed. Supports different tread materials and widths.

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Stair Landing Calculator

Calculate landing dimensions, placement, and code requirements for L-shaped and U-shaped staircases.

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Concrete Stair Calculator

Calculate cubic yards of concrete for poured stairs. Includes form dimensions, rebar requirements, and material quantities.

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Spiral Stair Calculator

Calculate spiral staircase dimensions including diameter, rotation degrees, rise per step, and building code compliance.

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Stair Railing Calculator

Calculate railing length, baluster count, baluster spacing, and materials for stair railings and guardrails.

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Stair Materials Calculator

Generate a complete stair materials list: stringers, treads, risers, screws, handrail, and balusters. Output as a printable shopping list.

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Why StairFox?

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Code Compliant

Calculations follow IRC 2018 residential building codes. Green/red indicators show compliance status.

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Visual Diagrams

Every calculator includes interactive SVG diagrams that update in real-time as you enter measurements.

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Always Free

No signup, no premium tiers. Professional stair calculations for free, forever.