As Global Printing Supplier, we take jobs from different countries and we find there are different standards or names for paper weight, here we take some time to prepare a Paper Weight Conversion Chart for your work, hope it can help.
Here are a few basics:
Basis Weight is used in the US. The weight is in pounds (#) of a ream of paper, which is 500 sheets. The paper stock can be different types, and different weights. But, the weight is based on a ream.
Metric System is standard in Asia and Europe. It uses grammage which is the weight of one square meter of paper. The grammage measurement is Grams per Square Meter (GSM.)
Any other questions about printing, just let us know. Thank you.