What is the R-value of cellulose insulation verses Fiberglass?

Generally, Fiberglass insulation has an R-value of about 2.7 per inch of thickness, compared to Cellulose R-value of 3.4 blown in or 3.8 settled per inch. Overall, cellulose is a denser product. So, cellulose is considered to have an overall better R-value than fiberglass insulation.