![]() Rafter² = rise² + run² (this formula is from the Pythagorean theorem) Here are the equations you may use to solve for the length of the slope and the rafter: Use the following formula which also describes a right triangle. You can also calculate roof pitch even without using a roof slope calculator. High-pitched roofs often need extra fasteners and their pitch can be as high as 21:12.They have a pitch ranging from 4:12 to 9:12. Conventional roofs are the easiest to construct and you can walk on them safely.Low-pitched roofs are generally difficult to maintain and you need special materials to prevent leaks.Generally, such roofs have a pitch ranging from 1/2:12 to 2:12. Flat roofs which aren’t perfectly flat require a small slope to allow for water runoff.You can divide roofs into these categories: Often, you express roof pitch as the ratio between the rise and the run in the form of x:12. You can assess this in two ways, either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Roof pitch refers to the slope which the rafter creates.
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