Formula For Finding Roof Pitch

Use the following formula which also describes a right triangle.

Formula for finding roof pitch. You can use the following equations to find the length of the rafter and the slope. Rise run pitch where pitch is expressed in percent. In the imperial unit of measurements the slope is expressed with the rise and run. The calculator above can handle much of this math.

Here are a couple examples. Slope measures the angle of change in elevation which can be obtained by dividing rise by run and multiply the result with 100. How to measure roof pitch. If you do need to calculate the pitch an estimate or shortcut is usually more practical than measuring the roof s overall dimensions.

Roof pitch formula image 1 12 to 12 12 roof pitch 7 12 pitch this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations. Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. This page offers you the rise and run formula to find the pitch slope angle of the roof of a building. It is computed by using the simple roof slope formula.

The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. Rafter rise run this formula is from the pythagorean theorem. Generally roof pitch is calculated from the same formula that describes a right triangle. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally.

Roof slope is also called as roof pitch. In civil engineering the slope is the numerical measure of the steepness of a roof. 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. You can also calculate roof pitch even without using a roof slope calculator.

Now divide the rise by the multiplier to get the pitch eg. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span. 48 10 4 8.

Here are the equations you may use to solve for the length of the slope and the rafter. Rafter rise run from the pythagorean theorem. Tan a rise y1 run x our sketch above shows how we calculate the roof rise per horizontal foot 12 inches of run when we are given the roof slope in degrees or as the roof pitch or angle expressed in degrees the purple sloped line is the sloping roof surface. The pitch of this roof is 4 8 12.

Divide the slope by two to get the pitch.