In football betting, "over 2.5" refers to a betting market where you are betting that the total number of goals scored during the match plus stoppage time will be over 2.5. This means that you will win only if there are three or more goals during the game, regardless of the correct score. The ".5" in "over 2.5" is used to prevent any confusion. This betting market is one of the most popular of all over/under (total goals) betting markets, and statistically speaking, most punters place a bet over or under the 2.5 goals amount.