Formula For Figuring Out Roof Pitch

Use the following formula which also describes a right triangle.

Formula for figuring out roof pitch.

Recalculate this value into an angle. 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. Angle arctan pitch arctan 0 25 14. Use our calculator to convert the roof angle to pitch if using an angle finder.

This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. 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. Finally you can find the roof pitch in the form of x 12. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally.

Calculate the roof pitch as the proportion of rise and run. Divide the slope by two to get the pitch. 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 a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally.

For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch. The slope is the same as the pitch. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch.

For a roof with the ridge above one wall the span is the same as the run. Find out how to calculate roof pitch on an existing roof. How to measure roof pitch. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

Rafter rise run this formula is from the pythagorean theorem. Image 1 12 to 12 12.