30 lb. Bag Calculator

Current R-Value Calculator

Looking for the 25 lb. Bag Calculator? Click here.

Current Type of Insulation:
Depth of Existing Insulation (in inches):

Please use the map and table below to determine the recommended R-Value for your area.


Map Notes:

Zone 1 includes Hawaii, Guam, Puerto Rico, and the Virgin Islands.

All of Alaska is in Zone 7 except for the following Boroughs in Zone 8: Bethel, Dellingham, Fairbanks N. Star, Nome, North Slope, Northwest Arctic, Southeast Fairbanks, Wade Hampton, and Yukon Koyukuk.

Zone U.S. DOE Recommended R-Value Range
1 R-30 to R-49
2-3 R-30 to R-60
4 R-38 to R-60
5-8 R-49 to R-60

Bag Calculator

Desired Total R-Value:
Square Footage:

Want to learn more about R-values? Click here.


Sign up for our monthly newsletter, TAP® Today, and be the first to receive stories, tips, special offers, and other useful items delivered right to your inbox.