Translate climate zone and R-value gap into a rough material plan for rolls, bags, kits, or boards.
Units To Buy
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Enter the area, climate zone, and current insulation level to estimate how much insulation to buy.
Tap an example to prefill the calculator with sample values.
Zone 5 attic top-up
900 sq ft attic upgrading from R-19
A common attic case where the recommended cold-climate target is far above the existing level.
Result: Large attics often require many bags because the R-value gap compounds across a wide area
Exterior wall upgrade
640 sq ft wall in a mixed climate
Useful for comparing a batt-style wall upgrade against a planning target that is lower than a full attic buildout.
Result: Wall upgrades need fewer units than attic blow-ins, but the cost per unit can still add up quickly