Measurements
Most nations describe paper in terms of grammage—the weight in grams of one sheet of the paper measuring one square meter. Other people, especially in the United States, describe paper in terms of pound weight—the weight in pounds per ream (500 sheets) of the paper with a given area (based on historical production sizes before trimming): for card stock, this is ; as compared to newsprint (thinner paper) of . In describing paper, the pound is often symbolized by the pound symbol, ''#''. Because of the difference in the way pound weight is determined, a sheet of 65# card stock is thicker and heavier than a sheet of 80# newsprint. The weight of cardstock ranges from 50# to 110# (about 135 to 300 g/m2). Rather than as a function of weight per sheet of a given area, paper thickness can be measured and stated directly, in units of linear measure. In the United States, this usually is expressed in thousandths of an inch, often abbreviated '' thou points'' (''pt.'' and ''pts.'') and ''mils''. For example, a 10 pt. card is thick (corresponding to a weight of about 250 g/m2), and 12 pt. is . The thou point (1/1,000 inch) differs from the typographical point (1/12 traditional pica = exactly 0.01383 inch = 0.35136 mm). The length and width of card stock often are stated in terms of the ISO system ofSee also
* Construction paper * Paper densityReferences
Paper Printing terminology {{Material-stub