Our Roofing Calculator helps you estimate the area of your roof and determine the amount of materials needed for your roofing project. Whether you are installing shingles, metal roofing, or other materials, this tool provides accurate measurements to help you plan and budget effectively.
How to Use
Use the Roofing Area Calculator to determine the total area of your roof
Enter your house base area and roof pitch for accurate calculations
Use the Roofing Material Calculator to estimate the quantity of materials needed
Adjust waste factor based on roof complexity (10-15% is typical)
Calculate total cost by entering material prices
Understanding Roof Pitch
Roof pitch is the measurement of a roof vertical rise divided by its horizontal run. It is typically expressed as a ratio (e.g., 6/12 means the roof rises 6 inches for every 12 inches of horizontal run).
Roof pitch affects the actual surface area of your roof. Steeper roofs have more surface area than their base footprint would suggest.
Roof Pitch Correction Factors
These factors are used to convert the base area to the actual roof area based on pitch:
Pitch
Angle
Multiply By
3/12
14.0°
1.031
4/12
18.4°
1.054
5/12
22.6°
1.083
6/12
26.6°
1.118
7/12
30.3°
1.158
8/12
33.7°
1.202
9/12
36.9°
1.250
10/12
39.8°
1.302
12/12
45.0°
1.414
Material Considerations
Asphalt Shingles: Most common, affordable, easy to install
Metal Roofing: Durable, energy-efficient, longer lifespan
Tile Roofing: Attractive, very durable but heavy
Wood Shingles: Natural look, requires maintenance
Slate Roofing: Premium option, extremely durable but expensive
Disclaimer: The calculations provided by this tool are estimates only. Actual requirements may vary based on roof complexity, installation methods, and other factors. Always consult with a professional roofing contractor before making material purchases.
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