UFC fights usually have five rounds, but only sometimes. For example, some title fights have five rounds, while others have only three.
The fights can last anywhere from 3 to 5 rounds, depending on the type of fight. Each round is 5 minutes long, with a 1-minute break between them.
This fight determines the number of rounds—for example, if it's a title fight for a belt, it will have five rounds; if it's an undercard fight on a pay-per-view card or a free card on Fox Sports 1 or ESPN2, then it will have three rounds.