Roofing Squares Calculator
Estimate a re-roof in seconds. Enter the roof footprint and pitch and this calculator returns the roof area in squares, the number of shingle bundles (three per square), and ridge cap bundles. A square equals 100 square feet of roof surface.
Estimate
How to use the roofing squares calculator
- Enter the footprint length and width of the roof in feet.
- Enter the pitch as rise per 12 inches of run (e.g. 6 for a 6/12 roof).
- Read the roof squares, shingle bundles, and ridge cap bundles.
- Add waste for hips, valleys, and starter/cap courses.
Questions
How many bundles of shingles are in a square?
Most architectural shingles come three bundles to a square (100 square feet). This calculator uses three bundles per square by default.
Why does roof pitch change the number of squares?
A steeper roof has more surface area than its flat footprint. The calculator applies a slope multiplier from the pitch, so a 6/12 roof covers more squares than its length × width alone.