Calculator

Attic Insulation Calculator

Estimate attic insulation bags from area and product coverage.

Use decimals when needed. Your estimate updates instantly and is safe to tweak before purchasing.

Read the matching guide to avoid common material ordering mistakes.

Attic Insulation Calculator FAQ

Should I remove old insulation first?

Not always; evaluate moisture, mold, and code requirements first.

How do I choose target R-value?

Follow local code and climate zone guidance for attic insulation levels.