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Stair Calculators

Calculate stair dimensions, stringer lengths, rise over run, spiral staircases, and landings. Free stair calculators compliant with BS 585 and UK Building Regulations.

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📐Free Stair Calculator — Steps, Rise, Run & Stringer (2026)

Free stair calculator — enter total rise for instant step count, riser height, tread depth & stringer length. Meets UK Building Regulations.

📐Free Stair Stringer Calculator — Length, Count & Layout (2026)

Free stair stringer calculator — get stringer length, count & layout for any staircase width. Covers 50×250 & 50×300 mm timbers.

📐Free Rise Over Run Calculator — Slope, Angle & Ratio (2026)

Rise over run calculator — free slope tool. Get ratio, percentage, angle & description instantly. Works for stairs, ramps & roofs.

📐Free Spiral Staircase Calculator — Treads & Dimensions (2026)

Free spiral staircase calculator — enter diameter & floor height for tread count, rise per step & rotation. Meets building regs.

📐Free Stair Landing Calculator — Flights & Dimensions (2026)

Free stair landing calculator — split flights with intermediate landing. Get steps per flight, landing height & total run.

📐Free Baluster Spacing Calculator — Count & Gap (2026)

Free baluster spacing calculator — get exact count and uniform spacing for stair and deck balustrades. Complies with Building Regulations.

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