what does an square of roofing material measure in feet?

I need to measure my roof to figure out how many squares of shingles I need to buy

Public Comments

1. im not sure of that but if i was you id just figure out the "square feet" of roof you need then see how many come in a carton and then u can see how many cartons you need. hope that helps, its how id do tile on a floor so dont see why it wouldnt work for a roof too good luck
2. In roofing terminology, a "square" is 100 square feet. Composition shingles (asphalt or fiberglass) come in bundles that cover 1/3 square. Roofing comes in rolls 3 feet wide and 36 feet long, for a coverage of about 1 square. When installing roofing over bare wood, roofing felt -- often called tar paper -- is laid down first. A roll of 15-pound felt covers about 4 squares; a roll of thicker 30-pound felt covers 2 squares. When ordering any of these materials, add 15 percent for waste. •
3. Means square feet. Divide the area of the roof by the area of a shingle