Roof Pitch Conversion Chart

Use the following formula which also describes a right triangle.

Roof pitch conversion chart.

The combination of two numbers are used to display or show the roof pitch. You can also calculate roof pitch even without using a roof slope calculator. 48 10 4 8. What is a roof pitch chart.

Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. These charts come in many various names and forms and we will look at how you can use a roof pitch conversion chart to learn about the most effective balance for your home with regard to getting the roof design right. Rafter rise run this formula is from the pythagorean theorem. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

The pitch of this roof is 4 8 12. Here are the equations you may use to solve for the length of the slope and the rafter. In essence a roof pitch chart is provided as a rough guide usually by a roofing company to help you see what the average roof pitches tend to be. We included a roof pitch chart below the 7 12 example image and the calculator below that.

On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. If this isn t practical then perform the same measurement on the underside of the roof.