Cellulose and Fiberglass Coverage Calculator

How many bags of cellulose and/or fiberglass do you need for a given job? Below is a calculator to help you determine the amount of bags you need for coverage.

Coverage Calculator

  • Insert Your Data in this Section

  • The Calculations Below Show You How Many Bags you Need

*Average coverage charts: [per 1,000 sq.ft.]

Cellulose:

  • Loose Fill Attics: R-30, 9.5” deep, (30lb. /bg) = 30 bags
  • Dense Pack Sidewalls: R-13,  2” x 4” wall, (30lb./bg) = 27 bags
  • Dense pack Sidewalls: R-20, 2”x 6” wall, (30lb./bg) = 40 bags

* 30lb. bag dimension = 14” x 15” x 28” long or 3.4 cu./ft. per bag

Fiberglass:

  • Loose Fill Attics: R-30, 10.5” deep, (33lb./bg) = 13 bags
  • Dense pack walls: R-13, 2” x 4” wall, (33lb./bg) = 13 bags
  • Dense pack walls: R-21, 2” x 6” walls, (33lb./bg) = 21 bags

* 33 lb. bag dimension = 8”x 20”x 38” long or 3.5 cu./ft. per bag

Note: *Average bag weight, volume, and coverage. Individual manufacturer’s specifications may vary.