Insulation Batts and Bundles Calculator

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Calculate batt insulation bundles from cavity count, batt size, pieces per bundle and waste.

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Product-label coverage wins. Labor, tax, delivery and tool rental are excluded. This is a shopping aid, not engineering or code-compliance design.
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What to buy

Calculate batt insulation bundles from cavity count, batt size, pieces per bundle and waste. Confirm package yield on the product label before buying.

How the estimate is calculated

The calculator keeps the raw need unrounded, applies the selected overage once, divides by label coverage, and rounds purchasable packages up.

Before you go to the store

  • Confirm package size and coverage.
  • Measure the full project.
  • Check substrate and installation requirements.

Worked example

Load the default project to see a complete package breakdown and expected leftover.

Misha Noyr, M.Eng.

Misha Noyr, M.Eng.

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