The expected value calculator shows whether a bet is profitable over the long run by comparing the sportsbook price to your projected chance of winning. To use it, select the odds format, enter your stake, add the offered odds, and then enter your estimated win probability to see the edge along with expected value in dollars and percent. For example, if you are considering a $100 bet at -110 and believe the true win probability is 55%, the calculator will show whether that wager is positive EV and how much value it carries over time. It is useful for separating bets that look appealing from bets that are actually worth making.