Roof Measuring Formula

Keep in mind that using google earth isn t going to give you a 100 percent accurate reading but it will give you a basic idea of the size of the roof for your calculations for the roofing materials.

Roof measuring formula.

Area is defined as the expanse or measurement of a given surface and there are a few methods for measuring your roof s area. Here are the equations you may use to solve for the length of the slope and the rafter. Measure both the width gable side and the length eave gutter side. If you have a simple gable roof you ll only need to measure and sum up the 2 planes of the roof.

Get unlimited measurements high definition imagery and free support. 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. Use the following formula which also describes a right triangle. It is often compared to slope but is not exactly the same.

Free aerial satellite and drone roof measurement software for roofing contractors. You can also calculate roof pitch even without using a roof slope calculator. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Record these values as roof rise over run with the vertical measurement listed first and the horizontal second.

Our roof calculator uses base length and base width to find the estimated area. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. 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. Just use it as a starting point and you ll have a fairly basic idea of what you re dealing.

Don t use this as your only method of measuring. The next step is to measure the pitch also referred to as the roof slope of the roof deck. This is only important for gable roofs as the calculator uses a specific formula to estimate roof run length of gable. 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.

For instance a 7 12 roof pitch means that the roof rises 7 inches. 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. Rafter rise run this formula is from the pythagorean theorem. The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials.

See the diagram.