Stairs
Stair Angle Calculator
Your measurements : vertical rise, horizontal run. Your estimate : angle, slope, rise per 12 run.
How the calculation works
Stair Angle Calculator
Angle = atan(Vertical rise / Horizontal run) × 180 / π; Slope = 100 × Vertical rise / Horizontal runBefore you order
- A straight flight is assumed. The upper floor is the final landing, so there is one fewer tread than riser. No headroom, landing, handrail or local code validation is included.
- Planning estimate only. This is not a structural design, a safety approval or a local code check.
Worked example
- Vertical rise
- 2 m
- Horizontal run
- 4 m
Angle 26.57 °
Slope 50 %