Recognizing what the odds represent is one of the most crucial parts of online betting. Bookmakers set prices depending on the possibility of an event happening. All of these set prices hide a percentage behind them, which is known as implied probability. Understanding the meaning of implied odds and identifying an outcome’s chances is undoubtedly beneficial for bettors.
The process of turning the odds provided by bookmakers into percentages helps reveal how much a bookmaker charges to allow you to place a bet. Since precise predictions are challenging in sports betting, mastering the method to calculate implied probability can significantly improve your wagering strategy.
How Implied Probability Works
Implied probability is the basis for creating an odds set or calculating the chances of a possible outcome. It is important to note that you should not confuse implied probability with odds volatility, which represents how susceptible a specific set of odds is to price changes.
Using implied odds and online bet calculators helps you determine if a betting market is beneficial, aiding in the comprehension of VIG (Vigorish or bookmaker profit margin).
To illustrate the concept simply, consider the rolling dice theory. Rolling a standard dice yields a chance of one out of six for each outcome. Since the probability of the dice landing on any of the six numbers is equal, the implied probability of any single number coming up is 16.66%.
The Importance of Implied Odds in Betting
Implied odds are a valuable alternative to simply reading the betting prices, as they help you answer the fundamental question: “How many chances will I have to win?”.
Using implied probability odds, you can find each selection’s value and discover how much you are paying the bookmaker as a commission. Because the total payout is always less than what bettors would receive if the odds reflected the actual chances, understanding the margin is vital.
Implied odds are crucial for several reasons:
- Finding value in betting.
- Choosing the highest odds bookmakers.
- Estimating the likelihood of a possible outcome.
- Securing the best prices.
Consistently considering the conversion process increases your chances of betting on value wagers and ultimately making a profit. Furthermore, the implied probability odds help you find and take advantage of “juicy odds” that carry a low VIG.
Formulas: How to Calculate Implied Probability
While you can utilize an Implied Odds Calculator for instant results, it is essential to understand the manual calculations for different odds formats. The different odds formats are merely alternate ways to express the same underlying probability.
1. Calculating Implied Probability from Decimal Odds
Decimal odds are the most common format type set by online betting sites. They offer the most direct reflection of your possible outcome for each bet placed. For example, 2.00 odds mean that for every €1 you bet, you will receive a €1 profit as a payout, and the implied probability is 50%.
The formula for decimal odds is:
$$\text{Implied Probability} = (1 / \text{Decimal Odds}) \times 100$$
Example (NBA Match: Heat vs. Warriors):
| Outcome | Decimal Odds | Implied Probability (%) |
|---|---|---|
| Heat to WIN | 1.71 | $(1 / 1.71) \times 100 = 58.4795%$ |
| Warriors to WIN | 2.20 | $(1 / 2.20) \times 100 = 45.4545%$ |
When converting the odds in this example, the sum of the probabilities (58.4795% + 45.4545% = 103.934%) surpasses 100%. This surplus (3.934%) represents the bookmaker’s guaranteed profit margin (VIG).
Self-Correction/Reverse Calculation: If you wish to calculate fixed odds from a given implied probability (e.g., 40%), the equation is $\text{Odds} = 1 / (\text{Implied Probability as a decimal})$. In this case: $1 / (40/100) = 1 / 0.4 = 2.50$.
2. Converting Fractional Odds to Probability
Fractional odds require a different conversion method.
The formula for fractional odds (expressed as numerator/denominator) is:
$$\text{Implied Probability} = (\text{denominator} / (\text{denominator} + \text{numerator})) \times 100$$
Example (Premier League: Leicester vs. Manchester City):
| Outcome | Fractional Odds | Implied Probability (%) |
|---|---|---|
| Leicester to WIN | 5/1 | $1 / (1 + 5) \times 100 = 16.6666%$ |
| Draw | 16/5 | $5 / (5 + 16) \times 100 = 23.8095%$ |
| Manchester City to WIN | 8/15 | $15 / (15 + 8) \times 100 = 65.2173%$ |
The conversion here indicates the great chances of Manchester City winning. The margin (VIG) in this 3-way market example is considerably bigger at 5.6934%. In general, the more possible outcomes in a market, the higher the VIG tends to be.
3. Calculating Implied Probability from American (Moneyline) Odds
Converting American odds requires solving two separate equations, depending on whether the odds are positive or negative.
For Positive American Odds (e.g., +185, representing the underdog):
$$\text{Implied Probability} = 100 / (\text{Positive American Odds} + 100) \times 100$$
For Negative American Odds (e.g., -225, representing the favorite):
$$\text{Implied Probability} = \text{Negative American Odds} / (\text{Negative American Odds} + 100) \times 100$$
Example (MLB Match: Rockies vs. Dodgers):
| Outcome | Moneyline Odds | Implied Probability (%) |
|---|---|---|
| Rockies to WIN | +185 | $100 / (185 + 100) \times 100 = 35.08%$ |
| Dodgers to WIN | -225 | $225 / (225 + 100) \times 100 = 69.23%$ |
Utilizing Specialized Tools and Resources
While manual calculation is fundamental, bettors can simplify this process using an Implied Odds Calculator. Furthermore, for Asian odds types (such as Hong Kong, Indonesian, or Malay odds), using a specialized converter is fastest. Manually, the most accurate method for Asian odds is to convert them first to decimals, fractional, or American odds, and then calculate the implied probability.
For serious bettors, understanding implied probability, combined with using tools like the Odds Converter and Bankroll Unit Calculator, allows for the creation of effective staking plans. This knowledge ensures that when looking for the best online bookmakers, you can compare odds, identify high commissions, and secure the most competitive prices.