Insulation Calculator
Calculate insulation for attic, walls, or crawl space.
Inputs
Total Area
0 sqft
Bags/Rolls
0
Estimated Cost
$0
How to Use This Insulation Calculator
Our free insulation calculator determines how much insulation you need for your attic, walls, or crawl space. Enter your area dimensions and desired R-value for material quantities and cost estimates.
R-value measures thermal resistance — higher numbers mean better insulation. Recommended values vary by climate zone. Our calculator suggests appropriate R-values for your location.
The calculator compares blown-in vs batt insulation options. Blown-in is better for irregular spaces; batts are cost-effective for new construction.
Related Topics
Frequently Asked Questions about Home Insulation
How much insulation do I need for my attic?
Measure attic floor area. Most climates need R-38 to R-60, which is 12-20 inches of blown fiberglass.
What R-value should my insulation be?
Depends on climate zone. Zones 1-2: R-30 to R-49. Zones 3-4: R-38 to R-60. Zones 5-7: R-49 to R-60.
How much does insulation cost per sq ft?
Blown fiberglass: $1-$2 per sq ft for R-30. Cellulose: $1-$1.50. Fiberglass batts: $0.50-$1.
What is the difference between blown-in and batt insulation?
Blown-in fills irregular spaces. Batts fit between studs. Blown-in is better for attics; batts for new construction.
Do I need a vapor barrier with insulation?
In cold climates, vapor barrier goes on the warm side. In hot humid climates, on the exterior side. Check local codes.
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