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Insulation Coverage Estimator

Estimate fiberglass batts or blown cellulose / fiberglass quantities to insulate an area to a target R-value.

Area to Insulate (sq ft)

Insulation Type

Target R-Value

Stud / Joist Spacing (for batts)

Waste Allowance (%)

Limitations: Bags-per-1000-sqft vary by product brand — always verify on the package. Batts for wall cavities differ from ceiling joists in length. This tool does not estimate rigid foam, spray foam, or mineral wool.

What to do next: For attics, cellulose installs at ~R-3.5 per inch settled. Fiberglass blown is ~R-2.5 per inch. Batts are R-3.1 to R-4.3 per inch depending on density. Always install a vapor retarder where climate requires.

Planning estimate only. Code-required R-values vary by climate zone — check IECC / local code. Always verify bag coverage on the product label.