Useful Data
Ramp Gradient
The gradient of a ramp can be expressed in different ways:
a) ratio
Divide the length of the ramp by the rise. i.e. dimension A divided by dimension B. (A/B)
b) angle
i.e. angle C
c) percentage
Divide the rise of the ramp by the length and multiply by 100. i.e. dimension B divided by dimension A multiplied by 100 (B / A x 100)
| Ratio | Angle | Percentage |
|---|---|---|
| 1 in 8 | 7.1 degrees | 12.5% |
| 1 in 9 | 6.3 degrees | 11.1% |
| 1 in 10 | 5.7 degrees | 10.0% |
| 1 in 11 | 5.2 degrees | 9.1% |
| 1 in 12 | 4.8 degrees | 8.3% |
| 1 in 13 | 4.4 degrees | 7.7% |
| 1 in 14 | 4.1 degrees | 7.1% |
| 1 in 15 | 3.8 degrees | 6.7% |
| 1 in 16 | 3.6 degrees | 6.3% |
| 1 in 17 | 3.4 degrees | 5.9% |
| 1 in 18 | 3.2 degrees | 5.6% |
| 1 in 19 | 3.0 degrees | 5.3% |
| 1 in 20 | 2.9 degrees | 5.0% |
To Calculate the Length of a Ramp
If the required gradient is expressed as an angle or percentage, use the chart to convert it to the ratio. Multiply the total rise of the ramp by this ratio. If the ground slopes then this must be taken into account in determining the total rise.
Usually the maximum length of a run of a ramp is 5 metres depending on the gradient. After each run of ramp a level rest platform is required.
Contact us at PARS and we will advise on the best ramp layout for any property.
Limits for Ramp Between Platforms
i) Ramps for Dwellings
| Maximum gradient | Maximum rise | Length of ramp run |
|---|---|---|
| 1 in 12 | 416mm | 5 metres |
| 1 in 15 | 666mm | 10 metres |
ii) Ramps for Public Access
| Maximum gradient | Maximum rise | Length of ramp run |
|---|---|---|
| 1 in 12 | 166mm | 2 meters |
| 1 in 15 | 333mm | 5 meters |
| 1 in 20 | 500mm | 10 meters |
