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Construction Calculators

Insulation Calculator

Calculate how many packages of batt insulation are needed to cover a given area, including a waste allowance.

sq ft
sq ft
Check the package label — typical batt packages cover 75-150 sq ft.
%
Area including waste —
Packages needed —
Ad Space — 300×250

About the Insulation Calculator

This calculator estimates how many packages of batt insulation you need to insulate a wall, floor or attic space, based on the area to be covered and the coverage listed on the product's packaging.

Formula: Area with Waste = Area × (1 + Waste %); Packages Needed = Area with Waste ÷ Coverage per Package

Choose an R-value appropriate for your climate zone and wall/ceiling assembly — higher R-values resist heat flow better but come in thicker batts that must match your cavity depth. Add extra for cutting around wiring, plumbing and blocking.

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