Sesivele sikhulume ezikhathini ezedlule mayelana amafomethi wephepha I-ISo ilawulwa ngo-1922 yizinga le-ISO 216 futhi lenziwa ngunjiniyela waseJalimane uDkt. UWalter Porstmann. Kepha kokuningi kwe- América, EU.SA, eCanada naseMexico, azilawulwa yila mafomethi ephepha, kodwa anetafula lawo lezilinganiso elichazwe futhi laqiniswa ANSI (American National Standards Insitute) ngo-1995, isilinganiso esibizwa nge-Anglo-Saxon. Amanye amazwe, njengePeru, asebenzisa la mazinga amabili ngokungaqondakali nangokufana kwamafomu awo.
Izilinganiso zephepha laseMelika zimi kanje: Incwadi (216 x 279 mm); Ezomthetho (216 x 356 mm); I-Junior Legal (127 x 203 mm); I-Tabloid (279 x 432 mm)
Ngakolunye uhlangothi, amaJapan awalawulwa yimithetho ethile esivele sikhulume ngayo, banetafula lezilinganiso zabo zamaphepha ezihluke kakhulu kunakuqala, futhi ezingasetshenziswa eYurophu naseMelika:
Uma ufuna ukuguqula amafomethi ephepha, ngikweluleka ukuthi uye kuleli khasi, lingasiza kakhulu ezikhathini eziningi, lilusizo kakhulu futhi lilula, futhi lingasetshenziselwa ukuguqula ezinye izinhlobo zezinyathelo noma zezimali, inezinketho eziningi eziwusizo: convertworld.com
amafonti nezithombe: incwadi, osayizi bephepha, imibala emine yempilo