Ever been given some arcane fractional measurement/calculation by an advertiser or client?  Instead of whipping out the calculator or asking a nearby 3rd grader, check out these resources to help you with your calculations. Cad Tools is supposed to be one of the best plug-ins out there. http://help.adobe.com/en_US/Illustrator/14.0/WS714a382cdf7d304e7e07d0100196cbc5f-631ba.html http://www.cadtoolsonline.com/free.htm http://tangent.qarchive.org/