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 pint capacity for basements, crawlspaces, garages, and damp rooms from dimensions, dampness level, moisture conditions, and airflow.
Open calculator → Home & BasementGarage Heater BTU
Estimate garage or shop heater BTU needs from square footage, ceiling height, insulation level, climate, temperature rise, and workspace conditions.
Open calculator → Home & BasementMini Split BTU
Estimate mini split BTU size from room dimensions, ceiling height, insulation, sun exposure, room condition, and heating/cooling planning assumptions.
Open calculator → Home & BasementInsulation Calculator
Estimate insulation batts, rolls, or packages from area dimensions, product coverage, cavity layout, waste, and material-buying assumptions.
Open calculator → Home & BasementWall Assembly R-Value
Estimate whole-wall or effective R-value from cavity insulation, studs, framing factor, continuous insulation, drywall, sheathing, windows, and doors.
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.