Roof Area Calculator
Enter your roof dimensions and pitch to calculate total area and materials needed.
Quick pitch examples
Low slope
4/12 pitch
Gentle slope, easy to walk
Standard
6/12 pitch
Most common residential
Steep
12/12 pitch
45° angle, dramatic look
feet
feet
enter rise only (e.g. 6 for 6/12)
Please enter valid values for all three fields.
Total roof area
—
square feet
Roof squares
—
1 square = 100 sq ft
Shingle bundles
—
3 bundles per square
Pitch multiplier
—
slope correction factor
Calculation breakdown
Footprint (W × L)—
Pitch multiplier—
Actual roof area—
+ 10% waste allowance—
Total with waste—
Results include a standard 10% waste factor. Always consult a roofing professional for final material estimates.