THERMAL EFFICIENCY ESTIMATOR
Roof Insulation Calculator
Calculate required attic insulation thickness in inches and total cubic volume to achieve target R-values.
Roof Insulation Calculator
Calculate required insulation thickness (inches) and total volume based on target R-value.
sq ft
Insulation Depth Formula
$$text{Required Thickness (in)} = frac{text{Target R-Value}}{text{Material R-Value per Inch}}$$
$$text{Material Volume (cu ft)} = text{Area (sq ft)} times frac{text{Required Thickness (in)}}{12}$$
Standard attic insulation targets range from R-38 in southern climate zones to R-49 or R-60 in cold northern climates, requiring 10 to 17 inches of cellulose or fiberglass.