Roofing Calculator

Calculate roofing materials needed — shingles, underlayment, and ridge cap for any roof size.

Enter Your Values

Roof Length (ft)

Roof Width (ft)

Roof Pitch (rise per 12" run)

Number of Roof Sections

Results

Fill in your values above and click Calculate.

Frequently Asked Questions

Q.What is a roofing square?

One roofing square = 100 square feet of roof area. Most shingle bundles cover 33 sq ft, so 3 bundles = 1 square.

Q.How much waste should I add for roofing?

Add 10-15% for a simple gable roof, 15-20% for complex roofs with multiple valleys and hips. Better to have extra than run short.