Batt Insulation Calculator
We'll adjust units, stud spacings, and insulation ratings based on your region.
Select the part of the building you want to insulate.
Enter the total area directly, or calculate it from room dimensions.
Choose the spacing between your wall studs, ceiling joists, or floor joists.
Choose the thermal resistance level for your insulation. Higher values mean better performance.
Our free batt insulation calculator helps you determine the exact number of fiberglass or mineral wool batt packs needed for your project. Batts are the most popular insulation type for DIY installations.
Getting your insulation quantities right the first time saves money and multiple trips to the store. Our calculator takes the guesswork out of insulation planning by providing accurate estimates based on your specific project dimensions, stud spacing, and target R-value. Whether you are a DIY homeowner or a professional contractor, this tool streamlines the estimation process.
Divide your total insulation area by the coverage per pack (typically 40-100 sq ft depending on R-value). Add 10% for waste from cuts around outlets, windows, and corners.
For 2x4 walls with 16-inch on-center studs, use 15-inch wide R-13 or R-15 batts. For 24-inch on-center spacing, use 23-inch wide batts.
Use faced batts (with vapor barrier) when insulating exterior walls with no existing vapor barrier. Use unfaced batts when adding to existing insulation or when a separate vapor barrier is installed.
Stay informed with expert tips on insulation, energy efficiency, and home improvement.
Proper home insulation is one of the most impactful upgrades you can make for energy efficiency. In this comprehensive guide, we cover everything from choosing the right insulation type—fiberglass batts, blown-in cellulose, spray foam—to understanding R-values and local building codes.
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R-value measures how well insulation resists heat flow. A higher R-value means better thermal performance and greater energy savings. But what R-value do you actually need? The answer depends on your climate zone and local building requirements.
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Your attic is the single biggest source of heat loss in most homes. Properly insulating it can reduce heating costs by up to 30%. From sealing air leaks around recessed lights to choosing between blown-in and batt insulation, these expert tips will help you.
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