The principle of value betting comes down to one sentence: only stake when the offered odds beat the fair odds. Over time, it is the accumulation of those small gaps that builds the result.
The formula
EV € = stake × EV %
Odds of 2.20 on an event that is genuinely 48% gives 0,48 × 2,20 − 1 = +5,6 %. On a €50 stake, the expectation is €2.80 — whether the bet lands or not.
Where does the true probability come from?
That is the whole difficulty: your EV is only as good as your estimate. Three approaches, from least to most reliable for an individual bettor:
- Personal judgement. Fast, but very exposed to bias — especially on the teams you follow.
- A statistical model. A Poisson model on xG gives a decent baseline for football.
- The devigged reference market. You take the odds of a very low-margin bookmaker, strip its margin, and get the best publicly available estimate. That is the method Stats&Bet uses, with logarithmic devigging.
Applied to French bookmakers
ANJ-licensed operators cannot exceed an 85% return to player on an annual average. On a PSG–Lyon, though, they often show 92 to 94%: the offset comes from niche markets, parlays and live betting.
Practical consequence: positive-expectation bets cluster on major events and on poorly adjusted secondary markets — and vanish within minutes, as soon as the bookmaker corrects.
Stats&Bet continuously scans Winamax, Betclic, Unibet, PMU, Betsson, Vbet, DaznBet and the rest, compares every price with the fair odds and alerts you on Telegram when the gap clears your threshold.
Frequently asked questions
How do you find positive-expectation bets without hunting by hand?
You have to permanently compare every French bookmaker price with the market's fair odds. Stats&Bet automates that calculation across thousands of markets and sends a Telegram alert as soon as a bet clears the EV threshold you set, with the suggested stake.
Does a positive EV guarantee a win?
No. Expectation describes a long-run average, not a single bet. Over a few hundred bets, variance dominates by far; it takes several thousand bets at +3% for the result to converge on the expectation. That is also why strict bankroll management is essential.
From what EV is a bet worth taking?
In practice, a 2 to 3% threshold filters out most of the noise from estimation error. Below 1%, the smallest mistake on the true probability is enough to tip the bet into negative expectation.
EV and CLV — what's the difference?
EV is assessed at the time of the bet, from an estimated probability. CLV (closing line value) is measured afterwards, by comparing your price with the closing price: it is the best arbiter of your bet quality, because the closing line is the market's most accurate estimate.