Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.
20 degree slope roof.
A 12 12 pitch roof has a pitch angle of 45.
Low slope roofs have gradients of 3 12 or less.
To do this simply convert the rise and run as a fraction to a decimal form eg.
What degree angle is a 12 12 pitch roof.
It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5.
With the use of this converter it will be easier for you to locate a 30 degree roof pitch 20 degree roof pitch 25 degree roof pitch or a 15 degree roof pitch.
The graph towards the top of the page shows a small range of angles from zero to 20 degrees.
However if you to do the process using your own knowledge you can still convert pitch to degrees by dividing the rise and run and get its corresponding measurement.
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.
Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch.
For a pitch expressed in inches per foot convert to a fraction.
Enter 2 44992 and reading the second output line we see this yields a 1 in 40 ratio and a 1 4321 degree angle.
The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.
Divide the first part of the ratio by 12 to work out the pitch.
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.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
The triangle diagram will be re drawn to scale with all dimensions marked.
To convert between american roofing ratios and pitch degrees follow these steps.
Drag sliders to animate the results and diagram.
First convert the pitch to a slope.
Find the inverse tangent of the pitch to find the angle in degrees.
Rise run rise run slope.
This chart covers a wider range.
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.
Let s suppose we are entering a grade that was computed by rise over slope length.
