Blown 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 blown insulation calculator helps you estimate the exact number of bags needed for blown-in fiberglass or cellulose insulation. Blown-in insulation is perfect for attics and hard-to-reach spaces.
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.
The number of bags depends on the area to cover, desired R-value, and material type. Each bag's coverage chart shows square feet per bag at specific depths. Our calculator estimates this for you.
Blown-in insulation fills gaps and irregular spaces better than batts, providing more complete coverage. It is ideal for attics and retrofit projects where access is limited.
For R-38, fiberglass needs about 12-14 inches of depth, while cellulose needs about 10-11 inches. For R-49, add approximately 3-4 more inches of depth.
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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