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Insulation Calculator
Find the insulation thickness needed to hit a target R-value, how many rolls or bags it takes, and the installed cost, by insulation type.
R-value measures how well insulation resists heat flow, and every material delivers a different R-value per inch, so spray foam hits a target in far less thickness than fiberglass. Pick your area and target R-value, common attic targets run R-38 to R-60, and the calculator works out thickness, quantity, and cost.
| Rolls or bags needed | |
| Estimated installed cost |
Estimate only. Coverage varies by product. Thickness assumes you are building up to the target R-value with a single material.
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Size the area first, then estimate the work.