Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.
Roof slope 45 degrees.
45 this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations.
Mansard roofs with nearly vertical faces can boast a pitch of 20 in 12.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
Enter any angle or fraction of angle to find pitch.
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.
Also see our page quick reference.
It s just a little math.
See below after the table for directions on how to convert any roof slope from one form to another even roof slopes not shown in the table.
This gives you a 45 degree pitch on your roof.
To convert between american roofing ratios and pitch degrees follow these steps.
Tan 45o 1 00.
As a sanity check we confirm that the tangent of 45 degrees is 1 or that two opposed 45 degree or 12 in 12 slope roof surfaces will form a 90 degree angle where they meet at the ridge and will form 45 degree angles where they meet the wall top plate or with respect to any horizontal line in the building.
Divide its rise by run in.
The rise will be equal to the amount of the incline within the given distance or the run that.
Degrees to roof pitch rise in run to see a table.
Determine its angle through taking a 12 inch level and.
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.
Find the inverse tangent of the pitch to find the angle in degrees.
The pitch is defined as the rise and span.
Identify the rise and run.
Enter any pitch or fraction of pitch to find angle.
Roof pitch interactive tools.
The 45 degree roofs seen on a frame houses are 12 in 12 but roofs can be even steeper consider the mansard roofs introduced by french second empire architects in the middle of the 1800s.
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.
The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages.
A 12 12 pitch roof has a pitch angle of 45.
This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.
