Stair Calculator
Stair Calculator
Risers, treads and Blondel comfort check
mm
Finished floor to finished floor height, in millimeters.
mm
Leave empty to derive the going from the Blondel comfort formula.
175 mm
Most residential stairs feel comfortable around 170–180 mm.
Blondel comfort formula: 2 × riser + going = 630 mm (comfortable between 590 and 650 mm). Always check your local building code.
Riser outside the 150–190 mm range
Going below 240 mm
Summary
| Risers | Riser height | Going | Treads | Angle | Total run |
|---|---|---|---|---|---|
| — | — | — | — | — | — |
2R + G = — mm
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