Use this simple formula to estimate your roofing needs

1. Measure your roof (length and width) and include overhangs. This can be done from the ground without the need of a ladder.

2. Use slope triangle chart below to determine the slope of your roof. Slope is the ratio of the rise of the roof in inches, to the run of the roof in feet.

3. Calculate shingle needs with the Easy Estimator on next page.
Slope Factors
2:12 1.01
3:12 1.03
4:12 1.05
5:12 1.08
6:12 1.12
8:12 1.20
10:12 1.30
12:12 1.41
14:12 1.54
16:12 1.67
18:12 1.80
To determine slope, stand back and line up appropriate calculator slope to actual roof line. Cut out the angle that matches your roof line.