Roof Slope Degree Calculator
Convert your roof pitch (rise over run) into exact degrees for engineering and solar panel installation.
Roof Angle (Degrees)18.4°
Roof Pitch4/12
Pitch vs. Degrees
In North America, roof steepness is almost exclusively communicated as a "pitch" or a ratio of Rise (vertical inches) over Run (horizontal inches, always 12). However, in many engineering applications, structural calculations, and solar panel installations, this steepness must be converted into a geometric angle (degrees).
The Math
Converting pitch to degrees requires trigonometry. You divide the rise by the run, and take the inverse tangent (arctangent) of that result, converting from radians back into degrees.
Frequently Asked Questions
What is the degree angle of a standard 4/12 roof?
A standard 4/12 roof pitch corresponds to an angle of 18.4 degrees.