Roof Area Calculator

Estimate your roof area for replacement, repair, or solar panel planning. Choose from house footprint or direct roof measurements.

Calculation MethodFrom House FootprintFrom Roof Dimensions

Building Length (ft)

Building Width (ft)

Roof Pitch(steeper = more area)Flat (0-1/12)Low (2/12)Low (3/12)Medium (4/12)Medium (5/12)Medium (6/12)Steep (7/12)Steep (8/12)Very Steep (10/12)Very Steep (12/12)

Waste Factor10% (Simple roof, few obstacles)15% (Standard — Recommended)20% (Complex roof, many valleys)25% (Very complex, many dormers)

Calculate Roof Area

Get a Professional Roof Estimate

Our roofing experts will inspect your roof and provide an accurate quote including materials and labor.

Schedule Free Inspection

This calculator provides estimates based on simplified measurements. Actual roof area may vary due to dormers, valleys, chimneys, and other features. A professional inspection is recommended for accurate quotes.