Roof Slope Conversion Table

The table below shows common roof pitches and the equivalent grade degrees and radians for each.

Roof slope conversion table.

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. Finding the best roof slope conversion chart. You can find the roof pitch in the form of x 12 like 4 12 or 9 12. The combination of two numbers are used to display or show the roof pitch.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. To obtain an accurate roof pitch measurement properly measure the rise and run. Roof pitch is the slope created by the rafter. Slope as grade for an elevation of 1 m over a distance of 2 m can be calculated as.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Finding the calculations needed to take things a step further with the roof conversion or development is going to take a lot of time and you need to have access to the best charts and software possible. Roof pitch on the form x 12 can be expressed in grades as. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Then you ll be able to measure slope from an unfinished attic space under the roof. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.