Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
Roof pitch angle 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.
If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.
Roof pitch refers to the slope which the rafter creates.
Enter any angle or fraction of angle to find pitch.
This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.
Use the diagrams on this page as a reference when inputting rise and run and while interpreting the calculated results.
You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.
Divide the first part of the ratio by 12 to work out the pitch.
If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.
First convert the pitch to a slope.
To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
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.
Run degrees and percentage.
For help converting any slope from one way of expressing it to another see roof slope expressed as rise.
45 this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations.
A 12 12 pitch roof has a pitch angle of 45.
Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree.
Roof pitch degree table.
Rise run rise run slope.
Roof online staff last updated july 10 2020 the following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.
Notes to the table above.
Enter any pitch or fraction of pitch to find angle.
For example if the roof pitch is 45 then sec 45 1 414213.
The roof pitch calculator calculates slope pitch angle and rafter lengths based on input of rise m and run r.
To do this simply convert the rise and run as a fraction to a decimal form eg.
Low slope roofs are from 0 to 3 12 in pitch.
To convert between american roofing ratios and pitch degrees follow these steps.
Some sources consider low slope to include 3 12 pitch roofs.
