Where do odds come from, and what do they mean? In simple terms, odds represent probabilities. Converting them is straightforward and helps bettors better understand and analyse betting markets. Below, we explain how betting odds are created and how they can be converted.
Betting odds come in various formats, with decimal odds being the most common in Europe. Decimal odds represent a predefined probability of an event occurring and also include the multiplier used to calculate potential winnings. A quick look at the odds shows how likely the non GamStop bookmaker believes a particular outcome is—although bettors may have a different opinion.
It is up to the bettor to calculate their own probabilities and implied odds to determine whether a bet offers value.
How Do Non GamStop Bookmakers Generate Sports Odds?
Best non gamstop soccer betting 2026 at non GamStop bookmakers are set by specialised trading or odds-setting departments. These teams assess the probability of an event occurring based on a wide range of data and analysis.
Once these probabilities are established, the corresponding betting odds are created for each match or event. Bettors can also calculate their own odds and compare them with those offered by the bookmaker to see how closely they align.
Calculating your own betting odds can help you decide whether a bookmaker’s odds are attractive. If the bookmaker’s odds are higher than those based on your own calculations, the bet may be worth placing.
The creation of betting odds generally happens in two stages. First, the so-called fair odds are calculated. From these, the real odds are produced by adding the bookmaker’s margin.
Conversion Of Betting Odds
Every betting odd implies a probability. For example, a probability of 50% means there is a 50% chance that Team A will win—roughly once in every two matches. This estimate is based on many factors, including previous meetings, current form, injuries, motivation, goal difference, pitch conditions, and more.
The following formula can be used to convert a probability into betting odds:
• Odds = 100 ÷ Probability
A probability of 50% therefore results in odds of 2.00. This figure is also used to calculate winnings (stake × odds). For every euro wagered, €2 would be returned if the bet is successful.
Because odds always imply a probability, the calculation can also be reversed:
• Probability = 100 ÷ Odds
Using this formula, odds of 2.00 correspond to a 50% probability. However, this does not necessarily reflect the non GamStop bookmaker’s original assessment, as a margin is added. For example, a true 50% probability might be adjusted to odds of 1.93 to ensure the bookmaker makes a profit.
Calculating The Bookmaker’s Margin
The bookmaker’s overall margin for an event can be calculated by adding together the implied probabilities of all possible outcomes. In a three-way market, this includes the probabilities for a home win (1), draw (X), and away win (2).
For example, in a football match:
• Chelsea win: 1.65
• Draw: 3.60
• Arsenal win: 5.25
These odds imply probabilities of 60.6%, 27.7%, and 19.0%. When added together, the total is 107.3%. Since probabilities cannot exceed 100%, the remaining 7.3% represents the non GamStop bookmaker’s margin.
This margin is a useful tool when comparing betting providers. As a general rule, the smaller the margin, the more favourable the odds are for bettors.
Converting probabilities into betting odds—and vice versa—is simple but extremely important in sports betting. The aim is not to bet on the most likely outcome, but on the odds that offer the best value relative to your own calculated probabilities.
A value bet occurs when the bettor’s calculated odds are lower than those offered by the bookmaker. This difference represents value, as the bettor believes the non GamStop bookmaker has underestimated the true probability of the outcome.