Calculate the amount of insulation material needed for your energy-efficient home. Our free insulation calculator helps you estimate materials and costs.
Total Area
300.00 sq ft
Estimated Total Cost
$300.00
Proper insulation can reduce energy costs by up to 40%. Always choose the right R-value for your climate zone.
Get your insulation materials and start your energy-saving project today
Shop at Home Depot →Insulation estimates usually start with the project area or volume, then add a waste factor before converting the result into bags, pieces, bundles, panels, or gallons. Use this calculator when you need a fast material estimate before ordering supplies, comparing costs, or planning a construction project.
Contractors, builders, remodelers, and DIY homeowners who need a practical jobsite estimate.
Start with the dimensions of the project, then choose material settings, price, and waste percentage.
The basic workflow is to determine r-value, calculate area, choose type, then round up so you do not run short during installation.
Depends on your climate zone. Zone 1-2: R-30 to R-49 attic. Zone 3-5: R-38 to R-60. Zone 6-7: R-49 to R-60. Check local codes.
Calculate the total cubic feet needed (area × thickness in feet), divide by coverage per bag. Check bag label for R-value and coverage.
Check local building codes for recommended R-values for your climate zone.
Measure area to insulate - attic, walls, floor, etc.
Fiberglass batts, blown-in, spray foam - each has different installation requirements.
For batts: area ÷ coverage per package. For blown-in: total cubic feet ÷ coverage per bag.
Add 5-10% extra for cuts and fitting around obstacles.
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