According to international standards, paper weight is measured in grams per square meter (g/m2). To convert this measurement to pounds, use this formula:
.2667 x g/m2 = lbs
Examples:
.2667 x 75 g/m2 = 20.0025 = 20 lbs
.2667 x 90 g/m2 = 24.003 = 24 lbs
.2667 x 60 g/m2 = 16.002 = 16 lbs
Convert from pounds to grams per square meter, use this formula:
lbs/.2667 = g/m2
Example
28 / .2667 = 104.99 (about 105 g/m2)