Formula For Figuring Out Roof Pitch

Rafter rise run this formula is from the pythagorean theorem.

Formula for figuring out roof pitch.

Here are the equations you may use to solve for the length of the slope and the rafter. For a roof with the ridge above one wall the span is the same as the run. Recalculate this value into an angle. You can also calculate roof pitch even without using a roof slope calculator.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch. Roof pitch calculator results explained slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run.

Use the following formula which also describes a right triangle. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Pitch rise run 1 5 6 25.

Image 1 12 to 12 12. Divide the slope by two to get the pitch. The slope is the same as the pitch. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally.

Calculate the roof pitch as the proportion of rise and run. How to measure roof pitch. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. Find out how to calculate roof pitch on an existing roof.