Answer: How long does your ramp need to be? The length of the stairs and the vertical height the ramp needs to ascend will determine the type of ramp you need. Also consult the guidelines in wheelchair or scooter manuals. The ramp length that you’ll need can be easily calculated with a few simple measurements.
1-Inch Rise: 12-Inch Run (4.8 degrees): The number of inches in total vertical height = the number of feet in length you need. For example, two 5-inch-high steps would account for 10 inches in total vertical height and would therefore require a 10-foot-long ramp. 1:12 is recommended for easy and safe maneuverability.
2-Inch Rise: 12-Inch Run (9.5 degrees): Calculate by dividing the total vertical height in inches by 2. A 2-inch:12-inch run is the maximum recommended for any ramp installation, including portable ramps used by occupied wheelchairs and scooters.
3-Inch Rise: 12-Inch Run (14.5 degrees): Calculate by dividing the total vertical height in inches by 3. This is the steepest incline a ramp should have and should never be used by occupied wheelchairs and scooters.
How wide does your ramp need to be?
To determine the ramp width you need, consider the following:
How wide is the wheelbase on your wheelchair or scooter? It's important to make sure your chair can safely cross the ramp surface with some margin for safety on either side.
If using a ramp to get in and out of a vehicle, consider the width of the door opening on your vehicle. Depending on the ramp you purchase, you'll need 30 inches or more for a door opening.
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