What Is Positive EV in Sports Betting?

Expected value (EV) is what your bet is worth on average if you could replay it infinite times. Positive EV (+EV) means you make money on average. Negative EV (-EV) means you lose. Every long-term winning bettor focuses on +EV exclusively.

The formula: - EV = (true probability × payout) − (1 − true probability) - Where payout is decimal odds minus 1.

Worked example. Lakers -3.5 at +100 on DraftKings. Pinnacle has the same line at -105. To find the true probability, you de-vig the Pinnacle market: strip the sportsbook's margin so the two implied probabilities add to 100%.

Pinnacle Lakers at -105 implies 51.2%. Pinnacle Thunder at -105 implies 51.2%. Total 102.4%. De-vigged: each side is 50%. So true probability of Lakers covering is 50%.

DraftKings is offering +100 (decimal 2.0) on a 50% true probability: - EV = (0.50 × 1.00) − (0.50 × 1.00) = 0 - Fair price. No edge.

If DraftKings offered Lakers -3.5 at +110 (decimal 2.10): - EV = (0.50 × 1.10) − (0.50 × 1.00) = +0.05 - 5% edge. That's a value bet.

This is exactly the math Slick's quant agent runs on every game across NFL, NBA, PGA, NCAAF, NCAAB. Pinnacle (or fallback sharp anchors lowvig and BetOnline) provides the de-vigged true price. Every soft book's offer is scored. Anything above the threshold becomes a posted pick.

Why most retail bettors lose: - They bet on gut, not on price. - They take -120 when fair is -110. That's a 5% edge they're paying away. - Over 1,000 plays, the vig drag alone eats 5-10% of bankroll. The model doesn't matter when you're bleeding to vig.

The only winning move is identifying +EV bets and playing only those. CleverBet's value finder does it daily.