Roof Measuring Formula

If you have a simple gable roof you ll only need to measure and sum up the 2 planes of the roof.

Roof measuring formula.

Don t use this as your only method of measuring. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Measure the length and width of each portion of the roof multiply length by width for each plane and then add the planes together for the total square footage. Use the following formula which also describes a right triangle.

Just use it as a starting point and you ll have a fairly basic idea of what you re dealing. Free aerial satellite and drone roof measurement software for roofing contractors. To calculate the size of the roof you need to measure the size of the roof as if it were flat account for roof pitch calculate square footage and finally determine how many squares of material are required for the roof the calculator above can handle all of this simply enter the length width and pitch and it will determine the size of the roof in squares. 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.

Our roof calculator uses base length and base width to find the estimated area. For instance a 7 12 roof pitch means that the roof rises 7 inches. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. Find the square footage of the roof.

The next step is to measure the pitch also referred to as the roof slope of the roof deck. Rafter rise run this formula is from the pythagorean theorem. See the diagram. Get unlimited measurements high definition imagery and free support.

The base width is the distance from one corner of your roof to the other at its base on the short side of your house. The roof area for a hip end is the same as for a gable end the intersection is equivalent to a hip slightly conservative so there is usually no need to consider triangles when measuring a roof. Measure both the width gable side and the length eave gutter side. Here are the equations you may use to solve for the length of the slope and the rafter.

It is often compared to slope but is not exactly the same. This is only important for gable roofs as the calculator uses a specific formula to estimate roof run length of gable. If your house has a hip roof then it does not matter which side is the length and which is the width for an accurate result. You can also calculate roof pitch even without using a roof slope calculator.

The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials.