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The stair's going/rise relationship — Blondel's rule

Why 2·rise + going ≈ 61–63 cm

2026-06-14·10 min reading

Why 2·rise + going ≈ 61–63 cm, and how to derive the number of risers and the going depth from the floor height. Blondel's pace-measure rule is still the basis for a comfortable stair.

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