Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.
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What is the formula to convert the roof pitch to degrees?
You will need a scientific calculator to make use of the formula or just use the table below. If you have a scientific calculator, the formula is:
angle of roof = atan(inches of rise/12)
Here are the angles for each inch of rise per foot:
Rise Angle in Degrees 1 4 3/4 2 9 1/2 3 14 4 18 1/2 5 22 1/2 6 26 1/2 7 30 1/4 8 33 3/4 9 37 10 39 3/4 11 42 1/2 12 45
Dave(Ask Dave) (About Dave)
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