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Roofing Calculator

A sloped roof has more surface than the footprint under it. This tool applies your pitch to the footprint to estimate roof area, then converts it to roofing squares. Use it to compare quotes, not to replace an on-site measurement.

Your result appears here after you press Calculate.

How it is calculated

  • Pitch factor = √(1 + (rise ÷ 12)²).
  • Roof area = footprint length × width × pitch factor × (1 + waste).
  • One roofing square = 100 sq ft.
  • Bundles = squares × bundles per square, rounded up.

Assumptions and limits

  • Assumes a simple roof. Hips, valleys, dormers and overhangs change the real area.
  • Bundles per square is product specific. Three is common for many shingles, so check the product.

Material estimates are for planning and ordering guidance. Coverage, yield and dimensions vary by product, so check the manufacturer's labeling. Structural work, roofing at height and code compliance should be handled by qualified professionals and confirmed with your local building department.

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