Roof Pitch Calculator
FREEConvert rise and run or roof angle into a usable pitch ratio, slope multiplier, and shingle square estimate from footprint area.
Slope multiplier converts flat plan area into actual roof surface area. One square = 100 square feet of roof surface.
Pitch ratio
0:12
Angle
0°
Slope multiplier
1.00
Shingle squares
0
Run the calculator to estimate actual roof surface area from your footprint.
📚 Recommended: Roofing Construction & Estimating — A classic reference for roof math, takeoffs, and estimating materials before you order shingles.
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