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Roofing Calculator

Estimate roof covering area from roof length, sloped length, roof sections and a waste allowance.

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Roof area including waste

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Roofing squares (100 sq ft each)

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Planning estimates only. Actual quantities and system requirements depend on product specifications, site conditions, local climate and building codes. Confirm measurements and consult a qualified professional before purchasing materials or sizing equipment.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Roofing Calculator

  1. 1 Choose measurement units and enter the requested dimensions or values.
  2. 2 Review the quantity or capacity and check the assumptions before ordering materials or selecting equipment.

How the calculation works

Each roof section is estimated as length times its sloped length. The areas are added and increased by the selected waste percentage.

Assumptions and limitations

This estimate does not identify roof pitch or include valleys, hips, flashing or manufacturer-specific bundle coverage. Verify with a roofer and product specifications.

Frequently asked questions

How does this calculation work?

Each roof section is estimated as length times its sloped length. The areas are added and increased by the selected waste percentage.

What should I keep in mind?

This estimate does not identify roof pitch or include valleys, hips, flashing or manufacturer-specific bundle coverage. Verify with a roofer and product specifications.

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