Formula For Figuring Out Roof Pitch

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.

Formula for figuring out roof pitch. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Angle arctan pitch arctan 0 25 14. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. Recalculate this value into an angle.

You can also calculate roof pitch even without using a roof slope calculator. For a roof with the ridge above one wall the span is the same as the run. Here are the equations you may use to solve for the length of the slope and the rafter. Find out how to calculate roof pitch on an existing roof.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Finally you can find the roof pitch in the form of x 12. Pitch rise run 1 5 6 25. For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 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. Rafter rise run this formula is from the pythagorean theorem. Image 1 12 to 12 12. How to measure roof pitch.

This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. The slope is the same as the pitch. Use the following formula which also describes a right triangle.

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 our calculator to convert the roof angle to pitch if using an angle finder.