Insulation Calculator
Estimate insulation coverage and rolls needed
Estimate how many rolls or batts of insulation you need for an area, based on the package's stated coverage.
Estimate insulation rolls or batts needed for an attic or wall area from the package's stated coverage.
Area
960
sq ft
Packages Needed
24
Estimated Cost
$720.00
How to Use This Calculator
- Enter the length and width of the area to insulate.
- Enter the coverage per package (from the label) in square feet.
- Enter the price per package if needed.
- Review the packages needed and estimated cost.
Why Use This Calculator?
- Ordering insulation for an attic or wall.
- Comparing package sizes and prices.
- Checking how much a given R-value covers.
Real-World Examples
A 40 × 24 ft attic, 40 sq ft per package
That's 960 sq ft, or 24 packages at 40 sq ft each — about $720 at $30 per package.
Frequently Asked Questions
What's R-value?
R-value measures how well insulation resists heat flow — higher means better insulation. Your local code recommends specific R-values for attics, walls, and floors.
Where do I find coverage per package?
It's printed on the packaging — the square feet one package covers at a given thickness.
Should I add extra?
A small amount for cuts and gaps is wise, but avoid compressing insulation, which lowers its R-value.
Important Disclaimer
Estimates based on the package coverage you enter. Actual needs depend on joist spacing, obstructions, and recommended R-value. Verify before ordering and follow local energy code.
Privacy
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