Insulation Calculator
Estimate insulation quantity, target R-value, added thickness, and rough material cost from area, climate zone, existing insulation level, and material type.
Last updated: 2026-03-25
Insulation calculator
Enter your values
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.
Calculation History(0)
Example calculations
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
How the insulation estimate works
The calculator sets a planning target R-value from the selected assembly type and climate zone, then compares that target against the current insulation level to find the remaining R-value gap.
That gap is translated into rolls, bags, kits, or boards using rough material-capacity assumptions so the result stays useful for planning without pretending to replace a manufacturer coverage chart.
Insulation calculator FAQs
How climate zone, assembly type, and material choice affect the insulation plan.
Why does climate zone change the target?
Because colder climates usually need higher R-values than warm climates to reach similar thermal performance. The calculator uses broad planning targets so you can scope materials before a final code check.
Are these quantities enough to place an order?
They are good planning estimates, not a substitute for a product data sheet or a full takeoff. Framing depth, compression, settling, and product-specific coverage charts can all change the final quantity.
Embed this calculator
Copy the code below to embed this calculator on your website or blog. It's free — no API key needed.
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Optional: auto-resize script
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