Pitched roof area calculator
Convert a horizontal footprint into pitched roof area.
Your measurements
Enter your project values. Your estimate updates as you type.
View your estimateExample values are a starting point. Check product yields and specifications before ordering.
YOUR ESTIMATE
Roof area with waste
Calculated from your measurements.
How it's calculated
Sloping area = footprint × √[1 + (pitch rise ÷ 12)²]. Apply waste. One roofing square = 100 ft².
Calculations use consistent units for your selected measurements. The waste allowance is applied once to the measured requirement. Whole purchase quantities are rounded up.
What this estimate includes
Assumes one uniform pitch across the entire footprint. Include eaves in the footprint; complex roofs need separate sections.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.