【How-to】What is 70lb paper in gsm

The thickness of a sheet of paper is indicated by its weight, which can be measured either in grams per square meter (gsm) or pounds per ream (lb). The standard weights of machine-made paper for artists are. 190 gsm (90 lb), or “student grade,” 300 gsm (140 lb), 356 gsm (260 lb), and.