Insulation pack calculator

Estimate net wall or ceiling area and full insulation packs to buy. Your inputs stay on this device.

Metric / US customary

Area lengthftArea widthftDoors and windowssq ftCoverage per packsq ftWaste allowance%Price per pack¤

Plan to buy

3insulation packs

108 sq ft net; 113.4 sq ft including waste. Estimated cost: $0.00.

Formulalength × width − openingsnet area × (1 + waste %) ÷ pack coverage

Choose the insulation type and R-value required for the assembly and local climate. This calculator only estimates package quantity.

How to use it

Measure once. Check the label. Round up.

Enter the finished dimensions of the area.
Copy coverage, package size and price from the product you will actually buy.
Use the result as a planning estimate, then confirm field conditions and supplier guidance.

Source & limits

Transparent by default

The editable defaults are starting points, not hidden guarantees. Product yield, pattern, breakage and site conditions can change the purchase quantity.

ENERGY STAR insulation project guidance →Read our calculation standard →

Reviewed 7 September 2026 · Formula, source, and edge cases checked · Automated tests passed

Keep planning

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