For printing notes and prescriptions, use papersize/papersize. You may print on any paper size as long as your printer can handle it. Letter is our recommendation (8.5" x 11") but you can also use legal (11" x 14") or A4 (17" x 11"). The best way to find out what size paper you need is to look at an existing note. Measure the width of the margin and add 2.5" to that number if you want a double-margin paper. That's your base number. Multiply by 0.75 for letter-size notes. Here are some other useful papersizes: US Legal - 8.5" x 14" - check with your printer to see if it can print on this size paper. A4 - 17" x 22" - the most common size used in Europe. B4 - 25" x 33" - popular in Japan. C4 - 35" x 44" - used by some computer printers. D4 - 50" x 66" - used by some photo printers. E4 - 75" x 99" - used by some mailers.