I would like to calculate FPKM for the gene output I get from an EdgeR analysis of RNA-Seq data. As part of the output I get CPM but I want to convert to FPKM. To do so I need the processed transcript length. With the Ref-Seq identifier I can down load from UCSC the Ref-seq table, but it does not have processed transcript length as a column. It has exons, and their start and end, which I could use to determine processed transcript length, but there has got to be an easier way.