About this calculator
How long an access ramp must be for a given rise and slope, and how many landings it needs.
How it’s calculated
Run = rise × slope ratio. Approved Document M: 1:12 up to 2 m going, 1:15 up to 5 m, 1:20 up to 10 m, with 1.2–1.5 m landings.
Worked example
With these inputs:
- Total rise
- 450 mm
- Slope
- 1:15
the result is:
- Ramp length (slope)
- 6.75 m
- Landings
- 2 (incl. top)
- Overall length with landings
- 9.75 m
- Angle
- 3.81°
Tips from the trade
- A gentler slope than the maximum is much easier for users.
- Handrails are required on both sides of most ramps.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the Building Regulations before ordering.