Guide

How value betting works

Everything you need to read the Oddkeel dashboard, explained with real numbers. Ten minutes, no maths degree needed.

1. The idea in one paragraph

Every price a bookmaker offers is an opinion about how likely something is. Most bookmakers are not the best at forming that opinion: they copy, adjust slowly and add a margin. A few sharp bookmakers are very good at it, because professionals bet with them and their prices move fast. Oddkeel takes the sharp price as the best estimate of the true chance, and flags every bookmaker that pays more than that. Do this many times and the small differences add up.

2. What fair odds are

Fair odds are the price at which a bet would be neither good nor bad in the long run. They are simply one divided by the chance of the outcome.

fair odds = 1 ÷ probability

If an away win has a 25 % chance, fair odds are 1 ÷ 0.25 = 4.00. Bet €10 at 4.00 a hundred times, win about 25 times, and you get back €1,000 for €1,000 staked. Any price above 4.00 is a value bet; any price below it costs you money over time.

3. Taking out the bookmaker margin

A bookmaker's odds always add up to more than 100 % when you turn them into probabilities. That extra is their margin. To get fair odds, we remove it. Here is a typical match:

Outcome	Odds	Implied chance	Without margin	Fair odds
Home	1.80	55.6 %	53.4 %	1.87
Draw	3.80	26.3 %	25.3 %	3.95
Away	4.50	22.2 %	21.3 %	4.68
Total		104.1 %	100.0 %

The 4.1 % above 100 is the margin. Dividing each chance by 1.041 gives the fair chances and fair odds. Oddkeel does this with the sharpest market, whose margin is small and whose prices are the most accurate.

4. Value %, calculated on a real pick

Value % tells you how much better a bookmaker's price is than the fair price.

value % = odds offered × fair probability − 1

A real pick from our 2024/25 backtest: Portsmouth against Derby in the Championship. The sharp market put the draw at 32.3 %, fair odds 3.09. Bet365 offered 3.25.

3.25 × 0.323 − 1 = +5.0 %

That means: on average, every €10 staked on bets like this returns €10.50. Not on this one bet, which either wins €22.50 profit or loses €10, but across many of them. This one ended 2–2 and won. Plenty of others lost.

5. Reading the value list

Each row on the dashboard is one bet worth looking at:

Match and league, with kick-off time.
Pick: home, draw, away, over 2.5 or under 2.5 goals.
Fair: the fair odds from the sharp market, margin removed.
Best: the highest price available right now and the bookmaker offering it.
Value: how far the best price is above fair. Green means positive value.

Use the filters to show only your leagues, only the bookmakers you have accounts with, and a minimum value. Prices move, so check that the bookmaker still offers the listed price before you bet.

6. A likely winner is not a good bet

The most common mistake is betting on whoever will probably win. Take a strong home side with a true chance of 75 %. Fair odds are 1.33. If the bookmaker offers 1.28, the value is 1.28 × 0.75 − 1 = −4 %. You will win most of these bets and still lose money over time. A long shot at a good price is a better bet than a favourite at a bad price. That is why most Oddkeel picks are draws and underdogs.

7. How much to stake

Set aside a betting budget you can afford to lose completely, separate from your other money.
Stake the same small amount on every pick, for example 1 % of that budget. Flat stakes keep losing runs survivable.
Bet singles. Combining picks into accumulators multiplies the risk and makes the long losing runs even longer.
Never raise your stakes to win back losses.

8. Losing streaks are normal

In the backtest about 3 in 10 picks won, at average odds around 3.7. With odds like these, runs of ten or more losing bets in a row will happen regularly, even when the method works. The backtest itself was down for several months in its first season and only broke even by the end of it. Judge results over hundreds of bets, not over a weekend.

9. Closing line value: your scoreboard

The closing line is the sharp market price just before kick-off, when the most information is in. If the price you took is better than the fair closing price, you have positive closing line value (CLV).

CLV = odds taken × fair closing probability − 1

CLV tells you much faster than your balance whether you are getting good prices, because it does not depend on luck in single results. In the backtest the average CLV was +1.3 %. Your bet tracker on Oddkeel shows your own CLV for every bet you log.

10. Key terms

Fair odds: The price without any bookmaker margin: one divided by the true chance.
Margin: The bookmaker's built-in profit: how much the implied chances add up to above 100 %.
Sharp market: Bookmakers whose prices are moved by professional money and are the best estimate of the true chance.
Value %: How much better the offered price is than fair. Positive means a value bet.
Best price: The highest odds offered for a pick across the bookmakers we compare.
CLV: Closing line value: how your price compares with the fair price at kick-off.
Flat stake: Betting the same amount on every pick, regardless of how confident you feel.
1X2: Home win, draw, away win.

Value is an estimate, never a guarantee. Only stake money you can afford to lose.