Enter the rise, run, and rafter length of a roof to calculate the the roof pitch angle and percentage.
Roof Pitch Formula
In short, a roof can be visualized as a triangle, therefore it’s numerical values can be calculated through the Pythagorean theorem.
rafter² = rise² + run²
- Where rise and run are the height and length of the roof.
rise / run = pitch, where pitch is expressed in percent
- Where pitch is the angle between the ground and the rafters.