Knowing the difference between paper sizes and titles is helpful not only in an office environment, but also if you are printing from your printer at home.
A4 paper is 8.26 by 11.69 inches. It is a European-sized paper that was created by the International Standards Association.
A5 paper is 5.83 by 8.27 inches. It is also a European-sized paper that was created by the ISO.
Both A4 and A5 papers are made for inkjet, laser and colour printers. Both come in bond, matt, parchment, soft gloss, gloss and high-gloss types.
A4 paper is produced in 24-pound weight sheets up to 58-pound weight. A5 paper is also produced in 24-pound to 58-pound weight.
A5 and A4 papers fit into envelopes designed for their respective sizes.