How long of a ramp should I buy?
Generally Recommended Slope Angles:
4.8-degree: This is Americans With Disabilities Act compliant – click here for more information about Roll-A-Ramp and ADA
7-degree: Manual wheelchair users who are independent or who have an attendant with limited strength
10-degree: Manual wheelchairs with a reasonably strong attendant
12-degree: Power wheelchairs or scooters and manual chairs with a strong attendant
15-degree: Restricted space, unoccupied loading/unloading
Determining Ramp Length:
Measure total rise (how many inches from lower level to upper level) and divide by the slope.
4.8-degree: Rise distance divided by 1
7-degree: Rise distance divided by 1.5
10-degree: Rise distance divided by 2
12-degree: Rise distance divided by 2.4
15-degree: Rise distance divided by 3
Example: For a desired slope of 7 degrees with a rise of 12″ (1 foot), 12/1.5 = 8 foot ramp