Definition of Total Rounds
What does the term "total rounds" mean in the world of boxing or mixed martial arts betting? What is a "Total Rounds" line?

Let's take a five-round UFC title fight.
The Total Rounds lines might look like this:
1.5 Rounds
Over, -275
Under, +225
2.5 Rounds
Over, -195
Under, +150
3.5 Rounds
Over, -110
Under -110
4.5 Rounds
Over, +165
Under, -185
So, let's say that you believe that this fight will end early - let's say in the first round.
In this case, you'd want to bet the Under 1.5 rounds, which would pay you a very nice $225 in profit for every $100 bet.