Rectangular duct surface calculator
Estimate the four-sided surface of a rectangular 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
14.3m²
Net surface area13 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
Excludes ends, seams, flanges and fittings. Include appropriate fabrication allowance.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.
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