Insulation calculators for quantity, R-value, comfort, and moisture planning.
Start with the measurements you actually know, then use the related calculators to estimate insulation quantity, whole-assembly R-value, heating/cooling size, and moisture-control needs.
Which insulation calculator should you use?
Need material quantity?
Use the Insulation Calculator when you already know the insulation product and need to estimate package count from length, height or width, and package coverage.
Need whole-wall performance?
Use the Wall Assembly R-Value Calculator when you want to include studs, cavity insulation, sheathing, drywall, continuous insulation, windows, and doors.
Need comfort sizing?
Use the heater, mini split, and dehumidifier calculators when you are planning comfort equipment and want a rough starting point.
Featured insulation-related calculators
These tools work together: one estimates material quantity, one estimates assembly performance, and others help with comfort planning.
Dehumidifier Size
Estimate dehumidifier capacity for basements, crawlspaces, and damp rooms from room dimensions and dampness level.
Open calculator → Home & BasementGarage Heater BTU
Estimate heater BTU needs for a garage, shop, or workspace.
Open calculator → Home & BasementMini Split BTU
Estimate mini split BTU size from room dimensions, ceiling height, and room conditions.
Open calculator → Home & BasementInsulation Calculator
Estimate insulation packages from area dimensions, package coverage, and waste allowance.
Open calculator → Home & BasementWall Assembly R-Value
Estimate whole-wall R-value including wall dimensions, cavity insulation, wood studs, drywall, sheathing, and continuous foam insulation.
Open calculator →Helpful insulation planning notes
- Labeled R-value is not always whole-assembly R-value. Studs, plates, headers, sheathing, windows, and doors can lower the full-system performance.
- Quantity and performance are different questions. A package-count calculator helps you buy material; an assembly R-value calculator helps you understand performance.
- Air sealing and moisture control matter. Insulation performs best when the assembly is dry, air-sealed, and installed correctly.
- Local code still controls. These tools are planning estimates, not code approval, energy modeling, or professional design.