Duct Insulation Calculator
Estimate duct-wrap insulation from round and rectangular duct dimensions, fittings allowance, overlap and waste, roll coverage and price.
Default project preview
6 rolls
Round duct area
209.4 ft²
Rectangular duct area
183.3 ft²
Fitting-adjusted area
451.7 ft²
Purchased coverage
600 ft²
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Round area = π × diameter × length. Rectangular area = 2 × (width + height) × length. Add fitting and wrap allowances, then round to full rolls.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Duct Insulation Calculator questions
Should fittings be measured individually?+
Detailed takeoffs can measure elbows, plenums and transitions separately. The editable fitting allowance provides a faster planning method.
Does nominal roll coverage include overlap?+
Not always. Keep seam and cutting allowance editable and verify the actual roll dimensions and installation instructions.
Does this choose the correct duct-insulation R-value?+
No. Enter quantities only after the required product and R-value have been determined.