Roof Area Calculator
Calculate roof area from house dimensions and pitch.
Last updated: June 2026
📋Full cost guides, how-to steps, and contractor pricing breakdowns at EstimatorSuite.com
Two slopes meeting at ridge. Most common US roof.
Roof Area Calculation
Total roof area1,342 sq ft
Roofing squares14 sq1 sq = 100 sq ft
Shingle bundles423 bundles/square
Estimated cost (asphalt shingle)Materials + labor, 2026 prices
$4,900 - $9,800
Calculation: 40'×30' = 1200 sq ft footprint × 1.118 (pitch factor) × 1 (shape) = 1342 sq ft roof area.
Disclaimer: These estimates are for budgeting purposes only. Actual costs depend on your location, current material prices, and contractor rates. Always get 2-3 quotes from licensed contractors before starting any project.