Here are the equations you may use to solve for the length of the slope and the rafter.
Roof measuring formula.
Our roof calculator uses base length and base width to find the estimated area.
Don t use this as your only method of measuring.
Free aerial satellite and drone roof measurement software for roofing contractors.
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.
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.
Just use it as a starting point and you ll have a fairly basic idea of what you re dealing.
Get unlimited measurements high definition imagery and free support.
Use the following formula which also describes a right triangle.
Find the square footage of the roof.
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.
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.
If you have a simple gable roof you ll only need to measure and sum up the 2 planes of the roof.
Area is defined as the expanse or measurement of a given surface and there are a few methods for measuring your roof s area.
Record these values as roof rise over run with the vertical measurement listed first and the horizontal second.
This is only important for gable roofs as the calculator uses a specific formula to estimate roof run length of gable.
The next step is to measure the pitch also referred to as the roof slope of the roof deck.
For instance a 7 12 roof pitch means that the roof rises 7 inches.
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.
Measure both the width gable side and the length eave gutter side.
The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials.
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.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
See the diagram.
