R-Value Calculator

Calculate total assembly R-value by summing the thermal resistance of individual cavity components.

Select Insulation Material (per inch)

Cavity Depth / Thickness (inches)

E.g., 3.5 for a 2x4 wall, 5.5 for a 2x6 wall.

Add standard OSB/Drywall (+R-1.0)

Total Assembly R-Value

Formula: R-value per inch × Thickness + Baseline Materials