Wheelchair Ramp Slope Calculator
Calculate the correct ramp length for safe and compliant wheelchair access
Calculate Your Ramp Requirements
Wheelchair Ramp Regulations in the UK
Wheelchair ramps must comply with Building Regulations Approved Document M and the Equality Act 2010 to provide safe, accessible routes for people with mobility impairments. The gradient of a ramp directly affects how easily it can be navigated by wheelchair users, whether self-propelling or with assistance.
Gradient Requirements
The gradient is the ratio of vertical rise to horizontal length. UK regulations specify maximum gradients based on ramp length and building type:
| Ramp Length | Maximum Gradient | Maximum Rise | Angle (Degrees) |
|---|---|---|---|
| Up to 2 metres | 1:12 | 166mm | 4.76° |
| 2 to 5 metres | 1:15 | 333mm | 3.81° |
| 5 to 10 metres | 1:20 | 500mm | 2.86° |
Width Specifications
Ramp width requirements vary by building type. Residential dwellings require a minimum width of 900mm, whilst public buildings and commercial premises must provide at least 1,500mm clear width to accommodate various wheelchair sizes and allow comfortable passage.
Landing Areas
Level landings are mandatory at the top and bottom of every ramp. These must be at least 1,200mm long and clear of any door swing. For ramps exceeding 10 metres, intermediate rest landings are required at intervals not exceeding 10 metres, with each rest landing measuring at least 1,800mm in length.
Handrails and Safety Features
Handrails are compulsory on both sides of the ramp for gradients steeper than 1:20. They should be positioned between 900mm and 1,000mm above the ramp surface, extending at least 300mm beyond the top and bottom of the ramp. Edge protection in the form of 100mm raised kerbs or upstands is required on any open side to prevent wheelchairs from slipping off the edge.
How to Measure and Plan Your Ramp
Step 1: Measure the Rise Height
The rise height is the vertical distance from the lower level to the upper level. Measure from the ground surface where the ramp will start to the threshold or surface at the top. Accurate measurement is crucial for determining the correct ramp length.
Step 2: Determine Available Space
Measure the horizontal distance available for the ramp. This will help you select an appropriate gradient. If space is limited, you may need to consider alternative configurations such as switchback ramps with intermediate landings, though these require more planning and construction expertise.
Step 3: Calculate Ramp Length
Multiply the rise height by the gradient ratio to determine the minimum ramp length. For example, a 300mm rise with a 1:12 gradient requires 3,600mm (3.6m) of ramp length. Always round up to maintain compliance with regulations.
Step 4: Consider Additional Features
Factor in space for top and bottom landings, each requiring at least 1,200mm. If your ramp will be longer than 10 metres, plan for intermediate landings. Account for handrail installation and edge protection in your overall design.
Portable vs Permanent Ramps
Portable Ramps
Portable ramps offer flexibility and can be moved as needed. Manufacturers typically recommend gradients between 1:8 and 1:12 for portable ramps, depending on whether assistance is available. A 1:12 gradient suits independent wheelchair users, whilst steeper gradients like 1:8 are acceptable only with assistance or for powered wheelchairs.
Permanent Installations
Permanent ramps must strictly adhere to Building Regulations. These installations require careful planning, appropriate materials, and often professional construction. Permanent ramps benefit from being custom-fitted to the location, with proper drainage, weatherproof surfaces, and integrated safety features.
Material Considerations
Both portable and permanent ramps require slip-resistant surfaces suitable for wet conditions. Aluminium is popular for portable ramps due to its lightweight yet durable properties. Permanent ramps often incorporate concrete, steel, or timber with appropriate non-slip finishes. All materials must withstand regular use and weather exposure without deteriorating.
Frequently Asked Questions
According to UK Building Regulations, ramps should not exceed 10 metres in length without an intermediate landing. The landing must be at least 1,800mm long to provide adequate rest space for wheelchair users.
Whilst steeper gradients save space, they compromise safety and accessibility. Gradients steeper than 1:12 are only acceptable for portable ramps with assisted use. Independent wheelchair users and those with limited upper body strength will struggle with steep inclines. Always prioritise safety over space-saving.
Most domestic ramps are considered permitted development and do not require planning permission, provided they meet certain criteria. However, listed buildings, conservation areas, and flats may have restrictions. Always check with your local planning authority before construction begins.
A gradient of 1:20 is ideal for independent wheelchair users as it requires minimal effort. Gradients between 1:15 and 1:12 are manageable but require more strength and effort. Anything steeper than 1:12 typically necessitates assistance.
Residential ramps require a minimum clear width of 900mm. Public and commercial buildings must provide 1,500mm to accommodate larger wheelchairs and allow for comfortable passage. Wider ramps enhance accessibility and safety.
Handrails are mandatory for gradients steeper than 1:20 and must be fitted on both sides of the ramp. They should be positioned 900mm to 1,000mm above the ramp surface and extend beyond the ramp ends for safe grip when mounting or dismounting.
Regular inspection for wear, damage, and surface deterioration is essential. Keep surfaces clean and free from moss, leaves, or ice. Check handrails for stability and ensure drainage systems function properly. Timber ramps may require periodic treatment to prevent rot.