Pot Odds
The ratio of the bet to call versus the total pot, to decide if a call is profitable
Definition
Pot odds are the ratio between the bet you have to call and the total pot size after calling. They express the minimum equity needed for the call to be profitable (break-even). If your equity exceeds the pot odds, the call is +EV. Formula: Pot Odds = Bet to call / (Pot + Opponent's bet + Bet to call). The result as a percentage = the minimum equity required. Pot odds are the basis of call/fold math in poker. If the pot odds are 25% and your equity is 30%, the call is +EV by 5% on every euro wagered. If your equity is 20%, the call is -EV by 5%. You should always compare pot odds and equity before deciding. Pot odds should also be combined with implied odds (potential future winnings) for spots where you can extract extra chips if you complete your draw.
Pot = €100, opponent bets €50. You have to call €50. The total pot after calling is €200. Your pot odds = 50/200 = 25%. You need at least 25% equity to break even on this call.