All Calculators/Insulation Calculator

Insulation Calculator

Calculate insulation coverage, rolls or bags needed, and cost by R-value and area.

— or enter total area directly —
The insulation calculator estimates required thickness, unit count, and optional material cost based on your target R-value and insulation type. It supports batt, blown, spray foam, rigid, and cellulose. Use it to spec the right product depth before ordering or subcontracting.
  • Climate zone determines minimum R-values — check the DOE zone map before spec'ing a product.
  • Spray foam has the highest R-value per inch but requires licensed applicators in most states.
  • Seal air leaks before insulating — insulation slows heat transfer but doesn't stop air movement.
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