What does Caliper mean?
Caliper is the thickness of a sheet of paper expressed in thousandth of an inch. This measurement is taken with a micro meter. Normally, paper caliper should not have more than a plus or minus 5% variance within a sheet. Usually the greater the caliper (the thicker the paper), the greater the paper weight but this depends on the density and finish of the paper. Therefore, the following chart is meant to be approximate. Every Paper.com paper shows the caliper for that particular paper.