Roof Pitch Conversion Table

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

Roof pitch conversion table.

This will give you the rise over run or pitch. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch is the slope created by 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.

For a more detailed explanation of the roof pitch multiplier see how to find the area of a sloped roof if you know the roof pitch in degrees find the secant of the slope using a scientific calculator for example if the roof pitch is 45 then sec 45 1 414213. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

The following table provides the roof pitch multiplier for roofs of various slopes. There are many tools out there. For example if you measure 4 inches the pitch of your roof is 4 12. What is a roof pitch chart.

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. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. Slope conversion tables 1 4 1 2 3 4 1 1 1 4 1 1 2 1 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 25 0 50 0 75 1 00 1 25 1 50 1 75 2 00 2 25 3 4 5 6 7 8 9 10. 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.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Usually they come in the form of a roof pitch diagram chart but other times it will be presented to you in a conversion format. S grade 1 m 2 m 50 slope and roof pitch. You can find the roof pitch in the form of x 12 like 4 12 or 9 12.

Example slope as grade. The combination of two numbers are used to display or show the roof pitch. Slope as grade for an elevation of 1 m over a distance of 2 m can be calculated as.