Round duct surface calculator
Estimate sheet or wrap area around a straight round duct.
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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
Sheet area with waste
10.367m²
Net surface area9.425 m²
Calculated from your measurements.
How it's calculated
Round surface = π × diameter × length. Rectangular surface = 2 × (width + height) × length. Apply waste.
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
Lateral surface only; ends, seams, fittings and insulation thickness adjustments are excluded.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.
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