Betting odds are the foundation of all sports betting and trading.
They tell you two key things:
- 📊 The probability of an event happening
- 💰 How much you can win from your bet
👉 Understanding odds is essential if you want to make better decisions and find real value in the market.
What Are Betting Odds?
Betting odds represent the likelihood of a specific outcome and the potential payout if your bet wins.
- 📉 Lower odds → higher probability
- 📈 Higher odds → lower probability
👉 In simple terms: odds reflect how likely something is to happen according to the market or bookmaker.
Types of Betting Odds
There are three main formats used worldwide:
- Decimal Odds (most common in Europe and Portugal)
- Fractional Odds (UK format)
- American Odds (Moneyline format)
👉 All formats represent the same probability — just in different ways. On exchanges like Orbit Exchange, the standard format is decimal.
How Decimal Odds Work
Decimal odds are the easiest to understand. The calculation is straightforward:
Example:
- Odds = 2.00
- Bet = €10
- 👉 Total Return = €20 (€10 stake + €10 profit)
Formula: Return = Stake × Odds
👉 This total includes your original stake.
How Odds Are Calculated
Odds are based on mathematical probability. The basic idea is converting a percentage into a decimal number.
Example:
- 50% probability → odds 2.00
- 25% probability → odds 4.00
Formula: Probability (%) = 1 / Odds
👉 This is what we call implied probability.
Implied Probability Explained
You can convert any odds into probability to see if you agree with the market.
- Odds 2.00 → 50% chance
- Odds 1.50 → 66.6% chance
- Odds 5.00 → 20% chance
👉 This helps you understand what the bookmaker or the market believes will happen.
How Bookmakers Set Odds
Bookmakers don't just calculate probability — they also include a profit margin.
👉 This is called the margin (or overround).
Example:
- Real probabilities for a tennis match (50/50) should add up to 100%
- Bookmaker odds might add up to 105% or more
- 👉 The extra 5% is their guaranteed profit
On exchanges, since there is no bookmaker margin, odds are generally much higher and fairer.
Why Odds Change
Odds are not fixed — they move constantly based on:
- 💰 Money being placed — heavy betting on one selection drives the odds down
- 👥 Team news — injuries, suspensions, starting lineups
- 📈 Market demand — what bettors believe will happen
- ⚡ Match events — goals, cards, red cards
👉 The market is dynamic and reacts to every new piece of information.
Odds vs True Probability
There is a crucial difference you must understand:
- ✅ True Probability = the actual chance of something happening
- 📊 Odds = the market's version (with margins and adjustments)
👉 This is where the concept of Value Betting comes from.
What Is Value in Betting?
A value bet happens when:
👉 Your Probability > Implied Probability of the Odds
Example:
- You think a team has a 60% chance of winning
- The odds imply only a 50% chance (odds 2.00)
- 👉 That is a value opportunity.
Odds in Trading (Exchange Perspective)
In betting exchanges:
- ✔ Odds are set by the users themselves
- ✔ There is no fixed bookmaker margin
- ✔ Prices move purely based on supply and demand
👉 This creates more accurate odds and higher returns for the trader. Learn more in our guide on how an exchange works.
Common Mistakes to Avoid
- ❌ Not understanding implied probability
- ❌ Betting only on high odds (chasing "luck")
- ❌ Ignoring the bookmaker's margin
- ❌ Not comparing odds across different platforms
👉 Knowledge gives you the edge needed to be profitable in the long run.
Conclusion
Betting odds are more than just numbers.
- 📊 They represent mathematical probability
- 💰 They determine your potential profit
- 🔍 They reveal market expectations
👉 Mastering the concept of odds is the essential first step for success in sports trading.
Get Started
👉 Learn to convert odds into probability.
👉 Compare your analysis with market odds.
👉 Focus on finding value, not just guessing winners.
🚀 Through BetAdvisor-PRT, you get access to the best odds on the market at Orbit Exchange and BFB247-96EX, with professional support for your journey.