How to Measure a Roof

1. Draw a diagram of your roof on a piece of paper. Label each section of the roof. You will write your measurements on the diagram to make it easy to calculate the roof area. Mark what you measure to make the process easier. 

2. Break the complex roof to simple sections such as triangles, squares, rectangles and trapezoids and calculate the area of each section.  

3. Get the total square feet. Add up the square feet you determined for each section and you will receive the total square feet of the roof. Remember that roofing materials are determined based on the number of squares, not the number of square feet. To calculate the number of squares of a roof, take the number of square feet and divide it by 100.

Print out Roof Measurements doc for your records. 

Alternative

You can order roof measurements from EagleView.com. They will provide you with the complete measurements and the sketch of the roof. You are responsible for paying for the services you receive.   

Also, you may need to use this tool to measure the roof
http://final-analysis.com/calculators/roof_area.htm