Insulation Calculator
✓ Your estimate
Estimated insulation needed
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packages
Switch display unit only.
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Net sq ft
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Sq ft incl. waste
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Packages
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Batts/roll pieces
View units
Calculate first to see unit conversions.
What this estimate includes
This estimate shows insulation coverage area, package count, and batt or roll-piece count based on the product coverage you enter.
How it’s calculated
Net area = length × height − openings
Adjusted area = net area × waste %
Packages = adjusted area ÷ package coverage, rounded up
Batts/roll pieces = adjusted area ÷ piece coverage, rounded up
Before you order
Insulation coverage depends on R-value, product type, framing spacing, and compression. Confirm package coverage on the product label before buying.
Frequently Asked Questions
What package coverage should I enter?
Use the coverage listed on the insulation package for the exact R-value and product type.
Should I subtract windows and doors?
Yes, subtract large openings for wall insulation to avoid overbuying.
Does this choose the right R-value?
No. It estimates quantity only. Choose R-value based on your local code and project area.
Disclaimer: This calculator provides estimates only. Actual quantities depend on product coverage, jobsite conditions, waste, and supplier details. Verify all quantities before ordering. See all interior material calculators.