Riser height171 mm
Tread depth250 mm
2 × riser height + going is 566 mm, outside the comfortable range of 630 mm ± 30 mm (the historical "Blondel formula"). This is a general rule of thumb, not a specific building code requirement.
Dimensions
KPitch angle38.9°
IRiser height171 mm
JGoing225 mm
Tread depth250 mm
LStringer length4,623 mm
Number of risers17
Headroom
ATotal rise (for headroom check)2,900 mm
BTotal run (for headroom check)3,600 mm
Materials
Stringer timber required (both sides)9,246 mm
Total tread area3.60 m²
Tread timber volume115.20 L
Stringer timber volume100.49 L