What Does +310 Mean in Sports Betting?

+310 is an underdog price. The plus sign means the team is the underdog, and the number is how much you win on a $100 bet. At +310 a winning $100 bet profits $310.00, because the market sees this outcome as less likely.

-310 is the favorite price: you risk $310.00 to win $100, and a $100 bet at -310 returns $132.26 ($32.26 profit), with an implied probability of about 75.6%. +310 is the reverse, an underdog price where $100 wins $310.00. At a sportsbook, the favorite opposite a +310 underdog is usually priced steeper than -310, because the vig comes out of both sides. See the full -310 odds breakdown.

A $100 bet at +310 returns $410.00 total, which is $310.00 in profit. Scale it to any stake with the betting calculator, or add +310 as a leg in the parlay calculator to see what it does to a multi-leg payout. The payout is the same idea at any book; what changes is how much vig is buried in the price.

+310 implies a win probability of about 24.4%. That is the break-even rate: if you think the real chance is higher, the bet has value. Devig the market with the no-vig calculator to compare it to the fair number. On a prediction market, the same 24% reads as a contract priced near 24 cents; the prediction market calculator converts between the two.

+310 American equals 4.10 in decimal odds and 31/10 in fractional odds. Decimal is the easiest format for comparing prices, since a bigger number always means a bigger payout. Convert any price with the odds converter.

Every American price at a sportsbook includes the vig. BettorEdge is a peer-to-peer betting exchange: you trade at market-fair odds with other bettors, so the same outcome can pay more than +310 and you keep more of the win. No sportsbook sets the line.