Calculate the roof angle - roof pitch
Rise / height (A) in inch*
Run / lenght (B) in inch*
roof angle (β)
*The conversion is pretty easy. Just take the lenght B as show in the picture and find it's corresponding height A. The calculator will do the rest. In the United States, slope is typically given in inches per 1 foot. In Europe roof pitches given in degrees (°) are inclinations. Be careful with this method as a roof may consist of multiple layers of tiles and insulation, or roofing that is irregular. This can lead to less precise results. The results are for information only and can only serve as an indication. No guarantee.