Roof Area Calculator

Estimate gable roof surface area using building dimensions and pitch. For basic footprint calculations, try our Rectangle Area Calculator. This tool converts results to square feet and square meters.

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Square Footage Concrete Slab Area Triangle Area
Example: 4/12, 6/12, 8/12 → enter 4, 6, 8.
Roof Area: —
Method:
Footprint area = L × W
Slope factor = √(1 + (rise/12)²)
Roof surface area (gable) ≈ footprint × slope factor
Example:
50 ft × 30 ft footprint = 1500 ft². With 6/12 pitch, slope factor ≈ √(1+0.5²)=1.1180 → roof ≈ 1677 ft².
Related Calculators:
Square Footage Room Area Concrete Slab Area Triangle Area

Frequently Asked Questions

Does this include overhangs?

No. Add overhang dimensions to length/width (or add a waste factor) if needed.

What roof types does this estimate work for?

This page estimates a basic gable roof surface area using pitch. Complex roofs may need multiple sections.

Should I add extra for waste?

Many roofing projects add 10–15% for waste, valleys, hips, and cuts.