Roof Pitch Slope & Angle Measurement
Convert roof pitch (e.g. 4/12, 6/12, 8/12) to exact roof angle degrees and measure roof slope from ground photos using digital protractor.
Target Angle
26.57°
Angle Type
Acute Angle (Roof Pitch 6/12)
Complementary
63.43°
Supplementary
153.43°
How to Measure This Angle on an Image or Photo
Roof pitch expresses vertical rise over 12 inches of horizontal run. A 6/12 roof pitch corresponds to an angle of arctan(6/12) = 26.57 degrees. Upload a side-profile photo of your house to measure slope instantly without climbing a ladder.
Visual Diagram: 26.57° 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