Roof Area Calculator
Calculate the total surface area of your roof based on your building's footprint and roof pitch. Essential for accurate material estimation.
The longest side of your building footprint
The shorter side of your building footprint
Steeper roofs have more surface area
Get a Professional Roof Measurement
Our team can provide an accurate on-site measurement and detailed quote for your roofing project - completely free.
How This Calculator Works
Step 1: Enter your building's footprint dimensions (length and width at ground level).
Step 2: Select your roof pitch. Steeper roofs have more surface area than the ground footprint.
Step 3: Choose a waste factor. More complex roofs with valleys and dormers require more materials.
Pro Tip: This calculator provides estimates for simple roof shapes. For L-shaped buildings or complex designs, we recommend a professional on-site measurement.
Next Step: Estimate Your Costs
Now that you know your roof area, use our Material Cost Estimator to compare different roofing materials and get a cost estimate.
Use Material Cost EstimatorReady for an Accurate Quote?
Get a free on-site inspection with precise measurements and a detailed quote. No obligation, no hidden fees.