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What is Pot odds in poker?

The ratio of the size of the bet a player is facing in relation to the size of the pot. For example, a player facing a half-pot bet can call risking 0.5 to win 1 (the pot) and 0.5 (their opponent's bet), and therefore is being laid odds of 3:1. They need 1 / (3+1) = 25% to break even on a call. A common misconception is that the player facing the bet needs 25% equity, when in fact they need to win 25% of the value of the pot. If that player could face future bets then they need to estimate their expected value rather than relying on raw equity.