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Attic Insulation Calculator

Estimate attic insulation bags from area and product coverage.

Use decimals when needed. This estimate updates live and is safe to tweak before you buy materials.

Minimum 100 sq ft. Use whole numbers for the clearest estimate.

Minimum 20 sq ft/roll. Use whole numbers for the clearest estimate.

Minimum 0. Use whole numbers for the clearest estimate.

Estimate updates automatically as you type.

Estimated insulation

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Buying guide

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.