On Sun, Jun 16, 2013 at 8:19 PM, Gerardo @neorigami.com < [email protected]> wrote:
> Thank you so much for your help. I wanted to ask you, is there a way I can > convert a gsm measure to the US method? Thanks! > I suppose one could create a formula for each basis type of paper in the US system and be able to convert between them. I usually just use one of many charts online that provide an approximate conversion for the common weights. http://www.paper-paper.com/weight.html I found another site with the formula for Text and Cover weight papers. http://okpaper.com/calculators/lbs-to-gsm 1lb. of Text paper = 1.48 gsm. Multiply each pound of text paper by 1.48. 1lb. of Cover paper = 2.708 gsm. Multiply each pound of cover paper by 2.708. In general, to convert GSM to US lbs you would need to know/guess the basis paper type that it would be considered in the US, then you would need to determine how many square meters the base size is for that type, determine the grams per sheet of that size, then multiply it by the number of sheets for that type (500) then convert it to lbs. I think that's right... Most of the nicer online paper stores I order from list as a courtesy, although it is frequently an estimate or approximation. It is somewhat peculiar that paper thickness is not really measured, but I assume that a lot of assumptions about thickness derive from the weight, with similarly weighted papers being close enough in thickness for most printing purposes. Maybe someone else has some information on that topic. malachi
