Roofing Calculator

Measure the house footprint (or each roof plane), pick the pitch and see the real roof area, squares and how many bundles to order.

Length ft (incl. overhang)

Width ft (incl. overhang)

Pitch (rise per 12)

Waste %

Bundles per square

Price per bundle $ (optional)

How it's figured

Roof area = footprint × pitch factor, where the pitch factor is √(1 + (rise ÷ 12)²): 1.118 for a 6/12 roof. One square is 100 sq ft. Most architectural shingles come 3 bundles per square. Add 10–15% waste for hips, valleys and starter.

For complex roofs, measure each plane separately and add them up.

Want this for every job, all year?

The Roofing Estimator does this and much more in Google Sheets and Excel: saved, organized and protected so nothing breaks. Buy once, $18.

See the Roofing Estimator

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