Roofing Calculator
Calculate roofing squares, bundles of shingles, and materials based on roof dimensions and pitch.
Results
How to Calculate Roofing
Multiply footprint length by width. Apply pitch multiplier to get actual roof area. Add waste factor. Divide by 100 for roofing squares. Multiply squares by 3 for bundles of shingles.
Frequently Asked Questions
How many bundles of shingles do I need?
Three bundles cover one roofing square (9.3 m² / 100 sq ft). A 200 m² roof at 6/12 pitch has roughly 224 m² of actual surface, needing about 24 squares or 72 bundles.
How do I calculate roof pitch?
Pitch is expressed as rise over run (e.g. 6/12 means 6 units of rise for every 12 horizontal). A steeper pitch increases actual roof area. Multiply the footprint area by the pitch factor to get true surface area.