Blown-In Insulation Bags Calculator

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Calculate loose-fill insulation bags from attic area, target R-value and the product coverage chart.

Need help with the calculation?
Choose an attic project
Waste, bag label & price
    Mini shopping list
    ItemPackageBuySubtotal

    Also plan for blower access or rental, but no rental cost is included. Use the exact coverage chart for the selected product and R-value. Labor, tax, delivery, baffles and air sealing are excluded. This tool does not select a code-required R-value.

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    What to buy

    Calculate loose-fill insulation bags from attic area, target R-value and the product coverage chart. Always confirm the selected product label before buying.

    How the estimate is calculated

    The calculator keeps the exact project need, applies overage once, divides by label yield and rounds purchasable packages up.

    Before you go to the store

    • Confirm package size and yield.
    • Recheck every project measurement.
    • Follow substrate and installation instructions.

    Worked example

    The populated default shows a complete package count, overage and expected leftover.

    Misha Noyr, M.Eng.

    Misha Noyr, M.Eng.

    Civil Engineer · 15+ yrs · structural design, geotechnics. Full bio ↓