How to use the Insulation Calculator

Estimate insulation packages for walls, floors or attics using a listed package coverage.

Calculation formula

Insulation packs = ceil(total area × (1 + waste%) ÷ coverage per pack).

Recommended steps

1. Enter values using the units shown beside each field.
2. Review whether the example assumptions match your situation.
3. Run the calculator and compare the key metrics.
4. Use the source data or official rates when precision matters.

Known limitations

Estimate assumes the selected insulation meets required R-value and fits the cavity size; verify building code and vapor control.