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Prices, promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

This Calculator should be used as an estimating tool ONLY.

  • When adding blown insulation to your home, you need to consider the R-value. Enter the blown insulation thickness (in inches) in the field below. Click on "Calculate" and the calculator will provide you with the R-value.

    Note: R-value is the measure of a material's ability to resist heat conduction. The greater the material's R-value, the better it performs as an insulator and the more money you save on your energy bill. All values assigned to insulation are based on specific thicknesses and are usually noted on the packaging. R-value can also be reduced if you compress the insulation in any way. Different areas of your home, such as roof or floor, might require different thicknesses of insulation depending on your region of the country.

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