Insulation Calculator
Calculate insulation materials, thickness, cost, and energy savings for walls, attics, and floors.
Area & Insulation Type
Wall, attic, or floor area
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Enter your area and R-values
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R-Value Comparison by Insulation Type
Thickness required to achieve each R-value by insulation type.
| Insulation Type | R-11 | R-13 | R-19 | R-30 | R-38 | R-49 |
|---|---|---|---|---|---|---|
| Fiberglass Batt | 3.5" | 3.5" | 6.25" | 9.5" | 12" | 15.25" |
| Blown-In Fiberglass | 4.4" | 5.2" | 7.6" | 12" | 15.2" | 19.6" |
| Blown-In Cellulose | 3.1" | 3.7" | 5.4" | 8.6" | 10.9" | 14" |
| Spray Foam (Open) | 3" | 3.5" | 5.1" | 8.1" | 10.3" | 13.2" |
| Spray Foam (Closed) | 1.7" | 2" | 2.9" | 4.6" | 5.8" | 7.5" |
| XPS Rigid Board | 2.2" | 2.6" | 3.8" | 6" | 7.6" | 9.8" |
| Polyiso Rigid Board | 1.9" | 2.3" | 3.3" | 5.3" | 6.7" | 8.6" |