120- 150 lb. What is the gram of paper?

"120- 150 lb paper" is a unit used to express the thickness of paper, that is, every 500 sheets (called one ream) weigh 120- 150 lb. That is to say, it is expressed in grams, that is, how many grams of paper is the weight per square meter, so this paper is called how many grams of paper, and it is also a unit used to express the thickness of paper.

So if we take large paper as an example, the size of the whole paper is 880MM× 1230MM, and there are 500 pieces of paper per ream. If it is 120 lb, it is 54432g, then the square meter = 54432 ÷ 0.88 ÷1.230 ÷ 507; .