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Roofing calculator

Turn a horizontal roof footprint into a sloped material estimate. Add pitch, extra material, bundle coverage and an optional price.

Planning estimate only. Assumes one pitch over the entered footprint. Roof shape, valleys, dormers, layers, starter/ridge pieces, underlayment, fastening, product coverage and local rules can change the order. Check package coverage and measurements with a qualified roofer. Never climb or measure a roof unsafely.

How many roofing bundles do I need?

Enter the roof area measured as a horizontal projection, then enter the vertical rise and horizontal run in the same unit. Add extra material and the coverage rate printed on your package. The calculator estimates sloped area, roofing squares and whole bundles.

Frequently asked questions

How many roofing bundles do I need?

Enter the roof area measured as a horizontal projection, then enter the vertical rise and horizontal run in the same unit. Add extra material and the coverage rate printed on your package. The calculator estimates sloped area, roofing squares and whole bundles.

Are my roof measurements uploaded?

No. This estimate runs in your browser and does not send your measurements to a server.

What is a roofing square?

One roofing square is 100 square feet of roof area. The result converts the sloped area plus your extra-material allowance into squares.

How do I find bundles per square?

Use the coverage information on the specific shingle package. Products differ, so this calculator does not assume that every bundle covers the same area.