Value bets (+EV): paid more than fair
A site pays more than the bet is worth. Why these come out ahead over time, though any one can lose.
4 min readChecked on Oct 31, 2026
A value bet (also called +EV, positive expected value) pays more than its true chance says it should. One value bet can lose. Hundreds of them, each paying a little too much, should come out ahead over time.
That is the whole idea. It is also why value bets take patience.
Value in one line
Value % = fair chance x decimal odds - 1The fair chance is the best guess of how often the bet really wins. The odds are what the site pays. If fair chance times odds is above 1, it is a value bet.
A coin flip at 2.10
- A bet that truly wins 50% of the time is offered at 2.10.
- Value = 0.50 x 2.10 - 1 = +5.00%.
- On average you make $5.00 for every $100 bet at prices like this.
- At the fair price, 2.00, you would make nothing on average. At 1.91, a normal site price for a coin flip, you would lose about $4.50 per $100.
Where the fair chance comes from
Nobody knows the true chance for sure, so it has to be worked out.
WynFynd uses a site known for accurate prices (a sharp site). It takes large bets and moves its prices quickly. By default that is Pinnacle, used only as a reference.
We take Pinnacle's prices on both sides and remove its cut (see the fair price). What is left is the fair chance.
A bet at another site is a value bet when its price is higher than that fair price. WynFynd only sends you one when its value % is at least your minimum. That is 3% unless you change it in Alerts.
Why value bets still lose, often
5% value is a lot in betting, and it still loses a lot of the time. Each bet in the example is a coin flip. This is how likely you are to be behind after $10 bets, worked out exactly:
| Bets | Average profit | Chance you are behind |
|---|---|---|
| 100 | +$50 | 30.9% |
| 500 | +$250 | 15.2% |
| 1,000 | +$500 | 6.9% |
So after 100 bets, about 3 in 10 bettors with real 5% value are still down. That is normal. It is not a sign the method is broken.
It is why you keep each bet small (see betting money and bet size). It is also why you judge yourself on beating the final price, not last week's profit.
The normal range for 40 bets
- 40 bets of $50 at 2.00, each with +3% value: a fair chance of 51.5% instead of 50%.
- Expected profit: 40 x $50 x 3% = $60.
- Luck alone moves the result by about $316 either way.
- Ending anywhere from -$572 to +$692 is normal. About 19 runs in 20 land there.
So a red month of 40 bets says very little. My bets draws this range from your own value bets and shows where you are inside it.
How much to bet
A formula (the Kelly formula) turns value into an amount. For the coin flip at 2.10, the full amount is 4.55% of your betting money.
WynFynd's Bet size bets a share of it. Normal, the default, bets a quarter: $11.36 on $1,000 of betting money. No one bet goes over 20% of your betting money. The bet size calculator shows Careful and Bold too.
Value bets and both-sides bets
- A both-sides bet bets every side. When every bet goes through, it wins a small, known amount whoever wins.
- A value bet is one side only. It makes more per dollar on average, but each result swings: you win or lose the whole amount.
- One-sided bets look more like ordinary betting. That can help an account last. Sites still notice steady winners, so read when a site limits you too.
Both need the same thing: a price better than it should be, caught before the site fixes it. The sooner you bet after a price appears, the more likely it is still there.