How It Works
Sloped area=horizontal area×√(1+(rise/12)²). One roofing square=100 ft². Footprint dimensions must include overhangs. Assumes a single uniform pitch, without dormers, valleys or openings.
Reference Sources
FAQs
How does this calculator work?
Sloped area=horizontal area×√(1+(rise/12)²). One roofing square=100 ft². Footprint dimensions must include overhangs. Assumes a single uniform pitch, without dormers, valleys or openings.
What assumptions should I check?
Check the units and definitions shown beside each input. Results use the values you enter.