Paper Weight Conversion Factors
Bond basis: 17 x 22 in (1 lb bond = 3.76 GSM)
Text basis: 25 x 38 in (1 lb text = 1.48 GSM)
Cover basis: 20 x 26 in (1 lb cover = 2.70 GSM)
Index basis: 25.5 x 30.5 in (1 lb index = 1.81 GSM)
Thickness: approx GSM x 0.001 mm (varies by paper type)