Insulation Calculator
Enter your area and the coverage printed on your insulation package to get the number of packages needed.
Coverage per package is printed on the bag or roll label — it varies by R-value and product, so enter the number from your specific insulation.
This calculator gives an estimate for planning purposes only. Verify quantities and code requirements with a qualified professional before ordering materials or performing work.
How it's calculated
Packages needed
packages = ceil(area / coverage per package)
Coverage per bag or roll varies by R-value, material (batt, blown-in, rigid), and manufacturer — it's printed on the package label, not a fixed constant.
Packages needed by area (88.7 sq ft coverage per package — check your product label)
| Area | Packages needed |
|---|---|
| 500 sq ft | 6 packages |
| 1,000 sq ft | 12 packages |
| 1,500 sq ft | 17 packages |
| 2,000 sq ft | 23 packages |
Skip the manual math on your next takeoff
Struvia reads your plans and pulls quantities like this automatically — upload a plan and see it measure a real takeoff.
Insulation Calculator FAQ
Why isn't coverage per package built in?
Coverage varies significantly by R-value and insulation type — an R-13 batt roll and an R-38 blown-in bag cover very different areas. Check the label on the specific product you're buying and enter that number for an accurate count.
Do I need extra insulation for cutting around obstructions?
For batts, add roughly 5–10% for cutting around outlets, wiring, and irregular framing bays. For blown-in insulation, minor obstructions have less impact on total bag count.
Does this work for both walls and attics?
Yes — enter the total square footage of the area you're insulating, whether it's wall cavities or attic floor area, along with your product's coverage rating.