Free online insulation calculator for homeowners and contractors. Calculate materials, costs, R-values, and thickness for blown-in, spray foam, fiberglass, cellulose, batt, and roll insulation. No signup required.
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Get ListedInsulation Calculator is a free online tool designed to help homeowners and contractors quickly estimate insulation needs for any project.
Whether you are insulating an attic, walls, crawl space, or basement, this calculator provides instant results including required materials, thickness, number of bags or board feet, and estimated costs.
The tool covers all major insulation types: blown-in cellulose, blown-in fiberglass, fiberglass batts, spray foam (open cell and closed cell), roll insulation, and foam board. Each type includes accurate R-value per inch data and current material pricing.
Key features include a step-by-step calculation breakdown showing exactly how the results are derived, quick example scenarios you can click to see instant results, calculation history saved locally so you can compare different options, and cost estimates for both DIY and professional installation.
The calculator also includes comprehensive guides on when to use each insulation type, cost comparisons between materials, and DIY recommendations to help users make informed decisions about their insulation projects.
Built for simplicity — just enter your dimensions, choose your insulation type and desired R-value, and get results instantly. No signup, no email required, completely free.
