Fraction betting odds are easier to convert into an implied winning percentage. For fraction betting odds, the formula is: Denominator / (Denominator + Numerator) If the fraction betting odds are 11/10, the formula would look like this: 10 / (11+10) = 10 / 21 = 0.4761904. Fractional odds, with the associated profits and payouts. Calculation Required. The calculation you need to know to work out the potential profit of a wager using fractional odds is as follows: For the total potential payout, you just add your initial stake to the potential profit. Using this Calculation.

Implied probability is basically the conversion of odds into a percentage. That percentage then shows the likelihood of an outcome happening based on the size of the odds. High odds suggest a low probability of something happening, while low odds suggest a high probability of something happening.

For example, imagine a tennis player is +200 to win an upcoming match. This would be 3.00 in decimal odds, and 2/1 in fractional odds. The implied probability for these odds is 33.33%. In this example, the odds suggest that the player has a 33.33% chance of winning the match.

In sports, the probability of something happening is usually subjective. There are several factors to take into account and there’s always a chance of the unexpected. No one can state definitively the exact probability of a player or team winning a game they’re taking part in. There’s an element of personal opinion involved.

Calculating the implied probability is useful though. It helps us decide whether or not we think a bet offers any positive value. We should always look for positive value when betting, and it exists when our estimated probability of an outcome happening is greater than the implied probability that the odds on that outcome suggest.

Fractional Odds Betting

Confused? Don’t worry! It’s not as complicated as it may seem. To make this easier to understand, let’s continue with the example of the tennis player at +200 to win his match. As we’ve said, the implied probability here is 33.33%. So if we think that the player has a GREATER than 33.33% of winning, then it makes perfect sense to bet on him. If we think his chances are less than 33.33%, it’s wise not to bet on him.

Fractional Percentage Calculator

If you’d like a more complete explanation on this subject, there’s an article in our sports betting guide that explains value and implied probability in further detail.