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Roofing Calculator
Calculate roof area from the footprint and pitch, then roofing squares, shingle bundles and underlayment rolls with waste.
Roofing Calculator
Roofing squares1,653 ft² roof surface (pitch factor 1.118)
Shingle bundles (3 per square)
50
Underlayment rolls (~10 squares each, synthetic)
2
Roof area (m²)
153.6
Gable roof estimate. Add for hips, valleys, dormers and starter/ridge caps (about 10–15% more on complex roofs).
Planning estimates only. Building codes, loads and material specs vary — have a licensed engineer or contractor confirm quantities and safety requirements. Disclaimer
Important
Quantity estimates for planning and ordering. Structural members, reinforcement and footings must be designed by a qualified engineer to local code.
Frequently asked questions
Is my data uploaded?
No. The calculation runs entirely in your browser — nothing you type is sent to a server.
Is it free?
Yes — free, unlimited and no sign-up.