Back عيار Arabic Çap Azerbaijani Калібр Byelorussian Калібр BE-X-OLD Калибър Bulgarian ক্যালিবার Bengali/Bangla Kalibr (armoù-tan) Breton Kalibar BS Calibre Catalan کالیبەر CKB
A calibre (or caliber in American English) is the diameter of the barrel of a gun. For example, a rifle with a diameter of 0.22 inch is a .22 cal. Guns that have a particular calibre are designed to fit and use bullets of the same calibre.