Insulation Calculator is a free online tool that helps homeowners, DIYers, and contractors estimate how much insulation they need for any home project. It covers all major insulation types including blown-in cellulose, spray foam (open-cell and closed-cell), fiberglass batts, rolls, mineral wool, and rigid foam board.

Simply enter the dimensions of the area you want to insulate and the calculator instantly returns material quantities, costs, and R-value recommendations. Dedicated calculators for attic, wall, blown-in, spray foam, and cellulose insulation. No signup, no registration.