Insulation Calculator
Calculate insulation R-value needs, square footage, and material quantities for walls, attics, and crawlspaces by climate zone.
Total square footage of the area to insulate (attic floor, wall surface, etc.)
Different locations have different R-value targets per energy code
Find yours at energy.gov/energysaver. Higher zones need more insulation.
Existing insulation R-value. Enter 0 if none. Fiberglass batts: ~3.2 per inch of thickness.
Closed-cell spray foam has the highest R-value per inch but costs the most. Blown cellulose is the best value for attics.
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