Attic Insulation Calculator
Insulation depth and material from current and target R-value.
Inputs
sq ft
Results
Thickness needed
10.27 in
Est. material cost
$4,108
R-value to add38
Total R-value achieved49
Insulation volume855.9 cu ft
Bags needed (blown-in)32
Est. annual energy savings$1,000
How to Use This Calculator
- Enter Attic area, Current R-value, and Target R-value.
- Set Insulation material, Fiberglass batts (R-3.14/in), and Blown fiberglass (R-2.5/in).
- Adjust Blown cellulose (R-3.7/in), Spray foam open-cell (R-3.7/in) as needed.
- Review Thickness needed (in) and Est. material cost ($).
- Use R-value to add and Total R-value achieved to inform your decision.
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