Roof Area Calculator
Calculates roof surface area accounting for roof pitch.
Lilu Baba's Roof Area Calculator adjusts a building's flat footprint area for roof pitch, since sloped roofs have more actual surface area than their footprint suggests.
How to use this calculator
- Enter the building's footprint length and width.
- Choose the roof's pitch category.
- Estimated actual roof surface area updates instantly.
Estimated Roof Surface Area (m²)
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FAQ
Roof Area Calculator — frequently asked questions
A steeper roof has more actual surface area to cover than its flat footprint, since the roof surface is angled rather than flat.
This uses simplified pitch multipliers for a quick estimate — a roofer's precise measurement accounts for your specific roof's exact slope and design.