Generally roof pitch is calculated from the same formula that describes a right triangle.
Formula to find the slope of a roof.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span.
Conventional slope roof range between 4 in 12 and 8 in 12.
Here are the equations you may use to solve for the length of the slope and the rafter.
Roof pitch calculator results explained slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run.
This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
Use the following formula which also describes a right triangle.
Outside of the u s a degree angle is typically used.
In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.
You can also calculate roof pitch even without using a roof slope calculator.
How to calculate roof pitch.
A flat roof has a slope of 2 in 12 or less.
If you know the angle of the roof in degrees you can find the roof pitch by converting the angle in degrees to a slope then finding the rise by multiplying the slope by 12.
Roof pitch degree table.
First find the slope by finding the tangent of the degrees eg.
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.
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.
Roof slope is also called as roof pitch.
Roof slope style.
There are two main categories of roofing.
Rafter rise run from the pythagorean theorem.
In the imperial unit of measurements the slope is expressed with the rise and run.
Slope tan degrees.
Tan 45o 1 00.
You can use the following equations to find the length of the rafter and the slope.
The run always remains constant at 12 inches.
Rise run pitch where pitch is expressed in percent.
Just write down the measurements you found.
A low slope roof is anywhere from 2 in 12 to 4 in 12.
Then multiply the slope by 12 to get the rise.
In civil engineering the slope is the numerical measure of the steepness of a roof.
Rafter rise run this formula is from the pythagorean theorem.
That is the roof s rise.
