How to read betting odds — and what they tell you

Decimal odds in one minute

Decimal odds show the total return for every 1 staked, including your original stake. A 10 bet at odds of 2.10 returns 21.00 if it wins: your 10 stake plus 11 profit. If it loses, the 10 is gone. The profit formula is stake × (odds − 1).

The same odds can be shown as 11/10 in fractional format (British style: 11 profit for every 10 staked, with the stake returned separately) or +110 in American format (110 profit from a 100 stake). Kuponcu uses decimal odds, as is standard across most of Europe and Turkey.

The chance hidden in the price

Odds also express a probability. Divide 1 by the price to get the implied chance: 2.00 implies 50%, 4.00 implies 25%, and 1.25 implies 80%.

Here is an example from our results. On 3 November 2026, Galatasaray hosted VfB Stuttgart in the Champions League. The best price on a Galatasaray win was 2.33, which implies a probability of 1 / 2.33 = 42.9%. Once the margin was removed, the sharpest bookmakers put Galatasaray’s chance at 45.0% (fair odds of 2.22). In other words, the available price was higher than the fair price: a value bet. Galatasaray won 2–0, but a value bet can lose just as any other bet can.

The bookmaker’s margin

Add the implied probabilities for all possible match results and the total will be greater than 100%. For example, odds of 2.10 for a home win, 3.40 for a draw and 3.60 for an away win imply 47.6% + 29.4% + 27.8% = 104.8%. The extra 4.8% is the bookmaker’s margin, also known as the overround or vig. It is built into the prices and gives the bookmaker an expected return of about 4.8% on stakes in that market, regardless of the result.

To calculate fair odds, remove the margin. The simplest approach is to divide each implied probability by the total: 47.6 / 104.8 = 45.4% for the home win, 28.1% for the draw and 26.5% for the away win. Those probabilities give fair odds of 2.20, 3.56 and 3.77. Kuponcu uses a slightly more refined method, described on the methodology page, which removes more of the margin from long shots because that is where bookmakers tend to place more of it.

Why odds move

Published odds do not stay still. They can change when team news breaks — an injury, a rested player or a new manager, for example — when large or well-informed bets arrive, or when other bookmakers move their prices. The final price before kick-off is called the closing line. It reflects most of the information available to the market and is usually the best public forecast.

That is why every Kuponcu tip includes minimum odds. If the price has dropped below that level by the time you check, the market has moved against the selection and it is no longer worth taking at that price. If the odds have gone up, the value is better than it was when the tip was published.

Try it yourself

Choose any match on the tips page and work through these steps using its odds:

• Note the three match-result prices and divide 1 by each one.
• Add the three implied probabilities. Anything above 100% is the margin.
• Divide each probability by the total to get the fair probability, then divide 1 by each fair probability to get the fair odds.
• Compare your figures with the odds and fair odds shown on the tip. The methodology page explains why the numbers may differ slightly.