How to measure a roof
Start by looking around and decide how to section the roof. (See plan below). The red dotted lines divide the sections. Count how many sections you have. Write this number down. Start with the largest section.
All your measurements will be, length times height. In the sample plan below all the blue arrows labeled L are the length. The red arrows are the height. The red arrow on the on the largest section of the plan below goes all the way from the front eave line, over the ridge and down the back, to the back eave line. Measure each section.
In the sample below you will have 5 different calculations and that should match the number of sections you wrote down, when you started. Add all your measurements together to get your total square footage. Measure all your hips, valleys, ridges, eaves and rakes. Divide your square footage by 100 to get how many squares of roofing material you will need.
Roof Calculator Software Information
Using Roof Calculator Software
Bid information Ridge & Starter per sq.
The ability to add ridge and starter to your total squares. This has nothing to do with ordering quantities.
Customer wants high priced ridge put on a 35yr comp roof. The comp shingles may cost around $47 per sq, but ridge may cost around $30 per bundle or box. So if you want to add ridge to your total squares and you entered 2, then 1 square would be added to your total squares for every 2 bundles of ridge.
40yr plus comp shingles about $72 per sq , roll starter $6 per roll. So this would be 12 rolls of starter = 1 sq. The program will calculate the correct amount of squares based on the number you put in. On many roofs it would not make much difference, but a big hip roof with 300ft ridge and 300ft starter? If you don’t want ridge/starter added to your total squares then leave either blank.
12/12 Roof Pitch Information
12/12 Roof Pitch 45° Degrees
Also referred to as 12/12 roof slope, 12 on 12, 12 to 12 and 12/12 roof angle
12/12 roof pitch to angle = 45.00 degrees equivalents
12/12 Roof Pitch 45° Degrees
10/12 Roof Pitch Information
10/12 Roof Pitch 40° Degrees
Also referred to as 10/12 roof slope, 10 on 12, 10 to 12 and 10/12 roof angle
10/12 roof pitch to angle = 39.81 degrees equivalents
10/12 Pitch 40° Details
9/12 Roof Pitch Information
9/12 Roof Pitch 37° Degrees°
Also referred to as 9/12 roof slope, 9 on 12, 9 to 12 and 9/12 roof angle
9/12 roof pitch to angle = 36.87 degrees equivalents
9/12 Pitch 37° Details
8/12 Roof Pitch Information
8/12 Roof Pitch 33¾ Degrees
Also referred to as 8/12 roof slope, 8 on 12, 8 to 12 and 8/12 roof angle
8/12 roof pitch to angle = 33.69 degrees equivalents
8/12 roof pitch to angle = 33.69 degrees
7/12 Roof Pitch Information
7/12 Roof Pitch 22½ Degrees
Also referred to as 7/12 roof slope, 7 on 12, 7 to 12 and 7/12 roof angle
7/12 roof pitch to angle = 30.26 degrees equivalents
7/12 Pitch 30.26° Details
6/12 Roof Pitch Information
6/12 Roof Pitch 26½ Degrees
Also referred to as 6/12 roof slope, 6 on 12, 6 to 12 and 6/12 roof angle
6/12 roof pitch to angle = 26.57 degrees equivalents
6/12 Roof Pitch 26½° Details