how to calculate true odds horse racing

To calculate true odds in horse racing, start by taking the odds posted by the racecourse, which are usually expressed as a fraction. Convert this into a decimal by dividing the numerator by the denominator. For example, if the odds are 3/1, you would divide 3 by 1 to get 3.00. Next, add 1 to this number. In this example, you would add 1 to 3.00 to get 4.00. Finally, divide 100 by this number to get the true odds as a percentage. In this case, you would divide 100 by 4.00 to get 25.00%, which means the horse has a 25% chance of winning.

Understanding Odds Formats in Horse Racing

The odds you see displayed for horse races come in various formats. Here are the most common:

  • Fractional Odds: Expressed as a fraction (e.g., 3/1). The first number represents the potential winnings, and the second number represents the stake (bet amount).
  • Decimal Odds: Written as a decimal (e.g., 4.0). This format represents the total amount returned for a $1 bet, including the bet amount.
  • American Odds: Displayed with a plus (+) or minus (-) sign (e.g., -120 or +150). Positive odds represent the amount you need to wager to win $100, while negative odds represent the amount you’d win on a $100 bet.

To convert between these formats, you can use online conversion tools or the following formulas:

  • Fractional to Decimal: Decimal = (numerator + denominator) / denominator
  • Decimal to Fractional: Numerator = (Decimal – 1) * Denominator, Denominator = 1
  • American to Decimal: Decimal = (Absolute value of American Odds + 100) / 100
  • Decimal to American: American Odds = (Decimal * 100) – 100
Odds FormatExampleTotal Return on $1 Bet

Calculating Decimal True Odds

Calculating true odds in horse racing involves converting fractional odds into decimal odds. Decimal odds represent the total return, including the stake, while fractional odds represent the profit. To calculate true odds, divide the denominator of the fractional odds by the numerator and add 1.

For example, to convert 2/1 odds into decimal odds:

  • 2 (denominator) / 1 (numerator) = 2
  • 2 + 1 = 3

Therefore, 2/1 odds represent a decimal true odd of 3. This means that for every $1 stake, you would receive a total return of $3.

Converting Decimal True Odds to Fractional Odds

To convert decimal true odds into fractional odds, subtract 1 from the decimal odds and divide the result by the remaining number.

For example, to convert decimal odds of 3 into fractional odds:

  • 3 – 1 = 2
  • 2 / (3 – 1) = 1

Therefore, decimal odds of 3 represent fractional odds of 1/1 (even odds).

Here is a table summarizing the conversion between decimal true odds and fractional odds:

Decimal True OddsFractional Odds

**Calculating True Odds in Horse Racing**

True odds are the real odds of a horse winning a race, as opposed to the odds offered by bookmakers, which include a built-in profit margin. To make informed betting decisions, understanding how to calculate true odds is crucial.

**Calculating True Odds from Decimal Odds**

Decimal odds are commonly used in horse racing and are easy to convert to true odds using the following formula:

**True Odds = 1 / (Decimal Odds – 1)**

**For example:**

Decimal Odds: 3.50
True Odds = 1 / (3.50 – 1) = 0.3333, or 33.33%

**Calculating True Odds from American Odds**

American odds, also known as moneyline odds, can be converted to true odds as follows:

**For odds expressed as +:**

**True Odds = (100 / |American Odds|) + 1**


American Odds: +200
True Odds = (100 / |200|) + 1 = 1.50, or 50%

**For odds expressed as -:**

**True Odds = 100 / |American Odds|**


American Odds: -150
True Odds = 100 / | -150 | = 0.6667, or 66.67%

**Calculating True Odds from Traditional Odds**

Traditional odds, also known as fractional odds, can also be converted to true odds:

**True Odds = (Odds/Denominator) + 1**


Fractional Odds: 3/1
True Odds = (3/1) + 1 = 1.3333, or 33.33%

**Calculating True Odds Using a Table**

The following table provides a quick reference for converting common odds formats to true odds:

| Odds Type | Formula | Example | True Odds |
| Decimal | 1 / (Decimal Odds – 1) | 3.50 | 0.3333 (33.33%) |
| American (+) | (100 / |American Odds|) + 1 | +200 | 1.50 (50%) |
| American (-) | 100 / |American Odds| | -150 | 0.6667 (66.67%) |
| Traditional | (Odds/Denominator) + 1 | 3/1 | 1.3333 (33.33%) |


Calculating true odds in horse racing is essential for accurate betting and understanding the real chances of a horse’s victory. By using the formulas and table provided, you can easily convert various odds formats to true odds and make informed decisions at the track.

True Odds Horse Racing: A Step-by-Step Guide

When you bet on a horse race, understanding the true odds can give you a significant advantage. Instead of using the odds provided by the bookmaker, which often include a margin, true odds represent the real probability of a horse winning.

Calculating true odds is a simple process that anyone can follow. Here’s a step-by-step guide:

1Gather the odds for each horse in the race.
2Convert the odds into decimal format by dividing the denominator by the numerator and adding 1. (e.g., 2/1 odds become 3.0)
3Multiply each decimal odd by 100 to get the percentage probability of each horse winning.
4Add up the probabilities for all the horses in the race.
5Divide the percentage probability for each horse by the total probability to get the true odds.

Interpreting True Odds to Inform Horse Race Bets

Once you have calculated the true odds, you can use them to make more informed betting decisions:

  • Identify value bets: If a horse’s true odds are higher than the odds offered by the bookmaker, it may be a value bet.
  • Manage risk: True odds can help you assess the potential risk and reward of different bets. Horses with lower true odds are more likely to win, but they also have lower payouts.
  • Compare horses: True odds allow you to compare the probabilities of different horses winning and make decisions based on relative value.

Remember, true odds are not an exact science, but they provide a more accurate representation of a horse’s chances of winning than the odds offered by the bookmaker. By using true odds, you can increase your chances of making profitable bets.

Well, there you have it, folks! Now you know how to calculate the true odds of a horse race. It’s not as hard as you thought, right? Remember, it’s all about crunching the numbers and doing a little bit of math. If you can do that, you’ll be one step closer to becoming a successful horse racing bettor. Thanks for reading! Be sure to come back later for more tips on how to win at the races.