Formula For Finding Roof Pitch

The calculator above can handle much of this math.

Formula for finding roof pitch.

For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. The pitch of this roof is 4 8 12. Here are a couple examples. In the imperial unit of measurements the slope is expressed with the rise and run.

How to calculate roof pitch. The pitch value can be obtained by dividing n by 12 and divide s by the answer. 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. Rafter rise run this formula is from the pythagorean theorem.

You can also calculate roof pitch even without using a roof slope calculator. For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch. Divide the slope by two to get the 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. Now divide the rise by the multiplier to get the pitch eg. How to measure roof pitch. Generally roof pitch is calculated from the same formula that describes a right triangle.

48 10 4 8. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. Use the following formula which also describes a right triangle. Slope measures the angle of change in elevation which can be obtained by dividing rise by run and multiply the result with 100.

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. 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. Rafter rise run from the pythagorean theorem. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

In civil engineering the slope is the numerical measure of the steepness of a roof. It is computed by using the simple roof slope formula. By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span. Here are the equations you may use to solve for the length of the slope and the rafter.

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.