Home & build · NUMORA
Stairs Calculator
Split storey height into risers; get rise and going.
Open interactive calculatorHow to use
Rule of thumb: 2×rise + going ≈ 630–650 mm.
Formula
rise = height / n; going ≈ 650−2R mm
FAQ
Is this Stairs calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Rule of thumb: 2×rise + going ≈ 630–650 mm.
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