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Paper Weight Conversion Chart
The European measurement of describing paper weight measures a single paper with a two dimensional height and width of one square meter. This measurement is noted as g/m2 (gm/m2, gsm, g/m2). The measurement may be measuring a hypothetical square meter, but is a good "apples to apples" reference because it compares the weights of different size papers.
The English method of paper weight may be more familiar to people, but it has its drawbacks when comparing weights of different size paper. The English method of measurement gives the weight of the paper as if weighing 500 sheets (or a ream). Differences in the dimensions of paper are not taken into account. Therefore, the English weight of a letter size paper that is thick and dense may be the same as a poster size paper that is light and tissue thin because 500 sheets of each weight the same. It's the "which weights more, a ton of lead or a ton of feathers" quandary.
