A +EV (positive expected value) bet is one where the price you're getting is better than the bet's real chance of winning. You won't win every one, but over many bets the edge adds up.
See today's +EV bets ›Every sportsbook builds a cut (the vig) into its prices, so both sides add up to more than 100%. Take that cut out and you get the market's fair chance. When several books agree on that fair chance and one book offers a better price than fair, that price is +EV.
At a true 50% chance, +115 pays $115 half the time and loses $100 half the time: an average of +$7.50 every $100 you bet.
We keep the list strict on purpose. A price only shows when it beats the fair price from at least three other books that agree with each other, stays between -250 and +250, isn't on an exchange (fees), and our own model doesn't lean the other way. Strong means at least a 3% edge; lean means at least 2%.
Positive expected value: the price pays more than the bet's real chance of winning is worth, so over many bets you expect to come out ahead.
Remove the sportsbooks' cut to get a fair price, usually from several sharp books together, then look for any book offering better than that fair price.
No. Unlike an arb, a +EV bet can lose. The profit only shows up on average over many bets.