Ensure your home is energy efficient with our Insulation Calculator. Find the Department of Energy recommended R-values for your climate zone and application (attic, wall, floor). Then, calculate exactly how much material you need based on your target R-value and insulation type.
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Calculate Insulation Needs & R-Value
Find recommended R-values by US climate zone and calculate insulation thickness and volume needed for your project. Fast, free, and 100% private browser tool.
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1
Find Zone
Select your US Climate Zone to see recommended R-values.
2
Choose Application
Select where you are insulating (Attic, Wall, etc.).
3
Calculate
Enter your area and target R-value to get thickness and volume requirements.
Key Features
R-Value Recommendations
Get specific R-value guidelines based on US Climate Zones (1-8).
Material Calculator
Calculate required thickness and volume for various insulation types.
Multiple Applications
Specific recommendations for Attics, Walls, and Floors.
Frequently Asked Questions
R-Value measures an insulating material's resistance to conductive heat flow. The higher the R-value, the greater the insulating effectiveness.
It depends on your application. Fiberglass is common and affordable, while spray foam offers higher R-values per inch and air sealing but costs more.
It varies by climate zone, but typically R-30 to R-60 is recommended. In colder climates (Zones 5-8), aim for R-49 to R-60.
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