A value bet is a wager where the odds offered by a bookmaker are higher than the true probability of the outcome occurring. When the price you are offered implies a smaller chance than your own estimate of the outcome, the bet has positive expected value (+EV) — meaning that, on average, it should return a profit over the long run.
The key idea is that bookmakers do not always agree with each other. When one book prices an outcome higher than the market consensus, that higher price may represent genuine value for the bettor who can spot it.
Every set of decimal odds implies a probability. The formula is:
Implied probability = 1 ÷ decimal odds
So a price of 2.00 implies a 50% chance (1 ÷ 2.00 = 0.50), and a price of 2.50 implies a 40% chance (1 ÷ 2.50 = 0.40).
Value exists when your own estimate of the true probability is higher than the probability the odds imply. The expected value of a bet is calculated as:
EV = (decimal odds × true probability) − 1
If the result is positive, the bet has value. For example, if you estimate a team wins 50% of the time, and a bookmaker offers 2.20, the expected value is:
(2.20 × 0.50) − 1 = 0.10, or a +10% expected return per unit staked. That is a value bet.
By contrast, if you estimate a 50% chance and are only offered 1.80, the expected value is (1.80 × 0.50) − 1 = −0.10 — a negative expectation you should avoid.
Instead of asking you to estimate the true probability yourself, oddstatus builds a consensus probability for every outcome from the prices of all tracked bookmakers. When a single bookmaker's price implies a lower probability than that consensus — in other words, when its odds are higher than the market average — oddstatus flags the outcome as a value bet and shows the overvalue percentage, the size of the gap between the book's implied probability and the consensus.
Finding a value bet is only half the job — you also need to decide how much to stake. The Kelly criterion is a formula that sizes your bet in proportion to your edge, maximising long-run growth while avoiding ruin. oddstatus's Kelly calculator takes your estimated probability, the bookmaker's odds, and your bankroll, and returns the optimal stake.
Value betting and arbitrage are related but distinct. A value bet carries positive expected value but can still lose on any single outcome — the edge only shows over many bets. An arbitrage (or “sure bet”) locks in a guaranteed profit regardless of the result by backing every outcome at the best available prices, which happens when the total implied probability across all outcomes is below 100%.
A value bet is a bet where the odds are higher than they should be based on the true chance of the outcome — so over time, backing these bets is expected to be profitable.
Convert the odds to an implied probability (1 ÷ decimal odds), compare it to your own estimate of the true probability, then compute EV = (decimal odds × true probability) − 1. A positive result means value.
No. Value betting has positive expectation in the long run, but individual bets can and do lose. It requires discipline, many bets, and sound bankroll management.
Yes. The value bets page compares every outcome against a consensus across 9 bookmakers and flags the ones where a single book's price is materially higher than the market, sorted by overvalue.
No. oddstatus is an educational odds-comparison tool. You place any bet directly on the bookmaker's own site — always verify the final price there first.