A staircase feels right when two step heights plus one going add up to roughly 63 cm — the length of an average stride.

Total rise — floor to floor (cm)280 cm

Preferred step height (cm)18.0 cm

Tread depth / going (cm)28.0 cm

✅ Comfortable

Comfort check (2 × rise + going): 63.0 cm

Number of steps

17.5 cm

Actual step height

420.0 cm

Horizontal space needed

504.8 cm

Stringer length