Measuring ADA Wheelchair Ramp Slope Angle
Learn how to verify wheelchair ramp slope compliance (1:12 ratio / 4.76° max) using side-profile photos and our digital protractor.
Target Angle
4.76°
Angle Type
Acute Slope (ADA Maximum)
Complementary
85.24°
Supplementary
175.24°
How to Measure This Angle on an Image or Photo
Under ADA Section 405, wheelchair ramps must not exceed a 1:12 slope ratio, corresponding to arctan(1/12) = 4.76 degrees. Upload a straight side-profile photo to inspect existing ramp compliance instantly.
Visual Diagram: 4.76° Angle Illustration
Step-by-Step Measurement Procedure
- Upload your image: Drag and drop a photo or blueprint onto the Online Protractor canvas.
- Position Point B (Vertex): Drag the central vertex dot directly onto the corner or angle origin.
- Align Ray A (Baseline): Drag the left handle so ray A aligns perfectly with your reference line.
- Adjust Ray C (Angle Ray): Drag the right handle until ray C lies exactly along the sloped edge.
- Read Angle Output: The tool displays degrees, radians, complementary, and supplementary angles in real time.
Measure Your Angle Now
Upload any photo or image to measure angles with sub-degree accuracy in your browser.
Open Online Protractor Tool