How to use
- Fill in: Floor-to-floor height (mm) and Target riser (mm). Fields with defaults or marked optional can stay as shown.
- Tap Design Stairs.
- Read the result - you can print or save it as PDF.
Worked example
With Floor-to-floor height = 3000, Target riser = 150:
RISERS NEEDED20 risers
- Actual riser height: 150 mm
- Tread (Blondel 2R+T≈630): 330 mm
- Number of treads: 19
- Total going (run): 6,270 mm
- NBC 2016 (A-2 home) max riser 190 mm: Your 150 mm is within
- NBC 2016 (A-2 home) min going 250 mm: Your 330 mm is within
- NBC 2016 max 12 risers per flight: 20 - needs 2 flights with landing
Uses the Blondel comfort rule (2×riser + tread ≈ 630 mm). Reference figures: NBC 2016 Part 3 cl 12.18 for one/two-family homes (which also sets 2.2 m headroom and 1.0 m min width). NBC 2016 has been superseded by SP 7:2026 and applies only as your local bye-law adopts it - verify current local rules before building.
