Enter length and height measurements and hit calculate to find roof pitch and angle.
How to work out an angle of a roof.
For a vertical plumb pipe through a pitched roof the corresponding roof pitch 12 12 or 45.
The most precise way to find the roof s slope is by measuring it from the underside.
How to figure roof angles.
Rafter height width from pythagoras remember that at school so.
Divide the length of the horizontal leg by the length of the diagonal leg using the calculator.
Recalculate this value into an angle.
Angle the angle of a roof is the same as the roof s slope except instead of being represented as x 12 it is represented in degrees.
Use a level against the underside of the rafter you re measuring to get the most accurate value.
First convert the pitch to a slope.
Calculate the roof pitch as the proportion of rise and run.
Angle arctan pitch arctan 0 25 14.
Record this as the roof width.
Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.
The angle of your roof is calculated the same way you d work the angle of a right angled triangle.
Measure and mark length on horizontal level to vertical level.
Pipe tube through sheeting angle offset diagram.
Press the inverse button then press the cosine button to display the angle between the horizontal and diagonal legs.
Determine the vertical height between the base of the roof and the highest point.
This is useful because sometime you may need to cut a bevel with your circular saw that is not calibrated using roof pitch style this setting on circular saws is calibrated in degrees.
This can be read from the architect s.
For many people working out the roof pitch angles can be a bit of a nightmare especially if you are going to do it yourself and try to manage it all on your own.
Access one of the rafters then take the measurement this way.
Locate the level s 12 inch mark.
Drag the slider to animate or with phone or tablet measure directly from roof surface.
Calculate the angle between the horizontal and diagonal legs of a right triangle.
Then mark height on vertical level to roof surface remove levels and measure marked height.
Enter set base measurement and use dimensions from the diagram at right to set pipe at correct angle through roof or sheeting.
Rise run rise run slope.
If you prefer to work the angle out the traditional way without our handy calculator you can use the following equations to find the length of the rafter and the slope.
To do this simply convert the rise and run as a fraction to a decimal form eg.
Finally you can find the roof pitch in the form of x 12.
Pitch rise run 1 5 6 25.
