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Calculator

Insulation Calculator

Estimate insulation rolls or batts from total area coverage.

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

Minimum 10 sq ft. Use whole numbers for the clearest estimate.

Minimum 10 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

Insulation Calculator FAQ

How do I choose R-value?

Use local climate guidance and building code requirements for your zone.

Do I include windows and doors?

For rough planning, full wall area is fine. For final purchasing, subtract openings.