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Wheelchair Ramp Slope Formula:
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The wheelchair ramp slope is the angle of inclination of a ramp, measured in degrees, which determines how steep the ramp is. It's calculated as the arctangent of the ratio between the vertical rise and horizontal run of the ramp.
The calculator uses the slope formula:
Where:
Explanation: The formula calculates the angle in degrees by taking the inverse tangent of the rise over run ratio, converting the result from radians to degrees.
Details: Proper ramp slope is crucial for wheelchair accessibility and safety. Steep slopes can be dangerous and difficult to navigate, while proper slopes ensure safe and comfortable access for wheelchair users and people with mobility impairments.
Tips: Enter the vertical rise and horizontal run in millimeters. Both values must be positive numbers. The calculator will compute the slope angle in degrees.
Q1: What is the maximum recommended slope for wheelchair ramps?
A: The maximum recommended slope is typically 1:12 (4.76 degrees) for commercial ramps and 1:8 (7.13 degrees) for residential ramps, depending on local building codes.
Q2: How do I convert slope from degrees to ratio?
A: Slope ratio = 1 : (1 / tan(degrees)). For example, a 4.76° slope equals a 1:12 ratio.
Q3: Why is ramp slope measured in millimeters?
A: Millimeters provide precise measurements for ramp construction. You can convert from other units if needed (1 inch = 25.4 mm).
Q4: What are the ADA requirements for ramp slopes?
A: ADA requires a maximum slope of 1:12 (4.76°) for wheelchair ramps, with specific requirements for landings, handrails, and width.
Q5: Can this calculator be used for other types of slopes?
A: Yes, the same formula applies to any slope calculation where you need to find the angle from rise and run measurements.