The Roof Pitch calculator computes the pitch of a roof based on the rise (r) and the run (R).
INSTRUCTIONS: Choose units and enter the following:
Pitch (P): The calculator computes the angle of the pitch in degrees and the approximate rise over run (e.g. 4/12)
The pitch of a roof is the ratio of the rise over run. Instead of angles (degrees or radians), a roof's inclination is typically given as the rise over run ratio. To formula for the pitch of a roof is:
P = atan(r/R)