Understanding
+EV Betting
The math behind beating the sportsbooks — explained simply, without jargon.
Prefer video? Watch our tutorialsWhat is Expected Value?
Every bet has a true probability of winning. When a sportsbook offers you better odds than that probability implies, you have a positive expected value (+EV) bet — one that makes money over time.
Quick example
True probability Team A wins: 52%
DraftKings offers +110 — which only implies 47.6% probability
EV% = 52% × 2.10 − 1 = +9.2% per dollar
You won't win every +EV bet. But over hundreds of wagers, positive EV means your bankroll grows. This is exactly how professional sports bettors approach every single bet.
How OddsQuanta finds your edge
We collect odds from 30+ sportsbooks, strip out the bookmaker margin (the "vig"), and reveal what the true odds should be — then surface every bet where a book is offering more than fair value.
OddsQuanta Method
Uses all 30+ sportsbooks to calculate consensus true probabilities. Works for every market including player props.
Pinnacle Method
Uses Pinnacle — the world's sharpest book — as the single source of truth. Best for main markets.
Both methods give you the same goal: a fair-odds baseline so you can see exactly which bets are priced in your favor.
Kelly Criterion
Knowing a bet is +EV isn't enough. You also need to know how much to bet. Kelly tells you the optimal fraction of your bankroll to risk.
The formula
Kelly % = (Win % × Decimal Odds − 1) ÷ (Decimal Odds − 1)
Example — 35% win chance at odds of 3.50:
(0.35 × 3.50 − 1) ÷ 2.50 = 9% of bankroll
On a $1,000 bankroll → bet $90
OddsQuanta calculates this automatically for every opportunity. The Kelly Stake column shows you exactly how much to wager based on your bankroll setting.
Why use Half Kelly?
Full Kelly maximizes long-term growth but creates huge swings. Most professional bettors use Half Kelly (0.5×) — you keep ~75% of the expected growth while cutting variance nearly in half.
$90
Full Kelly
1.0×
Recommended
$45
Half Kelly
0.5×
$22
Quarter Kelly
0.25×
Based on a $1,000 bankroll with 9% Kelly recommendation
Before you start
Variance is real in the short term. +EV requires volume — think hundreds of bets, not dozens.
Never bet more than you can afford to lose, no matter how strong the edge looks.
Some books limit or ban winning bettors. Spread your action across multiple sportsbooks.
Track every bet. Treating this like a business is what separates long-term winners.