Odds Converter - Convert Decimals to Fractions
An odds converter is a free and powerful tool that allows you to convert betting odds between different formats—Decimal, Fractional, and American (Moneyline)—and calculate the implied probability of any bet. Whether you’re a beginner or a seasoned punter, this tool helps you understand how odds work and make better, more informed betting decisions. Our odds converter is perfect for comparing odds across sportsbooks and understanding your chances of winning.
Odds Converter
How to Use an Odds Converter
Using our odds converter is simple and fast. Just enter the value in one of the supported formats—Decimal, Fractional, or Moneyline—and the tool will automatically display the equivalent odds in the other formats, as well as the implied probability. This helps you better evaluate the value of a bet and compare offers across different betting sites.
How to Convert Decimal Odds to Fractional Odds
To convert decimal odds to fractional, subtract 1 from the decimal value and express the result as a fraction. For example, decimal odds of 2.50 become 1.50 when you subtract 1, which is equal to 3/2 as a fraction. Our converter does this automatically and presents the simplest fractional format with whole numbers.
How to Convert Fractional Odds to Decimal Odds
To convert fractional odds to decimal, divide the numerator by the denominator and then add 1. For example, 5/2 as a fraction becomes 2.5 + 1 = 3.5 in decimal odds. This conversion helps you understand your total return including your stake.
How to Convert Moneyline Odds to Decimal or Fractional
Positive Moneyline Odds
For positive odds like +200, divide the odds by 100 and add 1. (+200 / 100) + 1 = 3.0 in decimal. Then convert the decimal to a fraction (3.0 - 1 = 2.0 = 2/1).
Negative Moneyline Odds
For negative odds like -150, divide 100 by the absolute value and add 1. (100 / 150) + 1 ≈ 1.67 in decimal. Then convert it to a fraction (1.67 - 1 = 0.67 = 2/3).
Our odds converter handles all these calculations instantly for both positive and negative American odds.
What Is Implied Probability in Betting and Why Use It?
Implied probability is the likelihood of an outcome happening based on the odds. It’s essential for identifying value bets—when the bookmaker’s odds underestimate the true chances of an event. Knowing the implied probability helps you make smarter bets and manage risk more effectively.
How to Calculate Implied Probability from Decimal and Fractional Odds
- From Decimal Odds: Implied Probability = (1 / Decimal Odds) × 100
Example: (1 / 2.50) × 100 = 40% - From Fractional Odds: Implied Probability = (Denominator / (Numerator + Denominator)) × 100
Example: 3/2 → (2 / (3 + 2)) × 100 = 40%
Benefits of Using Our Odds Converter
Instant and Accurate Conversions
Get real-time results every time. Our odds converter instantly transforms decimal, fractional, or moneyline odds with 100% precision, helping you save time and avoid manual mistakes.
Supports All Major Odds Formats
Whether you're dealing with UK Fractional odds, European Decimal odds, or American Moneyline, our tool can handle them all—making it ideal for international betting.
Implied Probability Calculator
Understand your real chances of winning. The tool automatically calculates implied probability, helping you assess risk and betting value more accurately.
Great for Learning and Understanding
If you're new to betting, our odds converter is an excellent educational tool. Learn how odds work and how they translate into potential profits.
Odds Conversion Table
We’ve included an easy-to-read odds conversion table on this page so you can reference the most common conversions between decimal, fractional, and American odds. It’s especially helpful for comparing odds manually or learning how the formats relate to one another.
| Fraction | Decimal | American (Moneyline) | Implied Probability |
|---|---|---|---|
| 1/100 | 1.01 | -10000 | 99% |
| 1/50 | 1.02 | -5000 | 98.0% |
| 1/25 | 1.04 | -2500 | 96.2% |
| 1/10 | 1.10 | -1000 | 90.9% |
| 1/5 | 1.20 | -500 | 83.3% |
| 2/9 | 1.22 | -450 | 81.8% |
| 1/3 | 1.33 | -300 | 75.0% |
| 2/5 | 1.40 | -250 | 71.4% |
| 4/7 | 1.57 | -175 | 63.6% |
| 1/2 | 1.50 | -200 | 66.7% |
| 4/5 | 1.80 | -125 | 55.6% |
| 5/6 | 1.83 | -120 | 54.6% |
| 10/11 | 1.91 | -110 | 52.4% |
| Evens (1/1) | 2.00 | +100 | 50% |
| 11/10 | 2.10 | +110 | 47.6% |
| 6/5 | 2.20 | +120 | 45.5% |
| 5/4 | 2.25 | +125 | 44.4% |
| 6/4 | 2.50 | +150 | 40% |
| 13/8 | 2.63 | +163 | 38% |
| 7/4 | 2.75 | +175 | 36.4% |
| 2/1 | 3.00 | +200 | 33.3% |
| 5/2 | 3.50 | +250 | 28.6% |
| 3/1 | 4.00 | +300 | 25% |
| 4/1 | 5.00 | +400 | 20% |
| 5/1 | 6.00 | +500 | 16.7% |
| 6/1 | 7.00 | +600 | 14.3% |
| 7/1 | 8.00 | +700 | 12.5% |
| 8/1 | 9.00 | +800 | 11.1% |
| 9/1 | 10.00 | +900 | 10% |
| 10/1 | 11.00 | +1000 | 9.1% |
| 11/1 | 12.00 | +1100 | 8.3% |
| 12/1 | 13.00 | +1200 | 7.7% |
| 13/1 | 14.00 | +1300 | 7.1% |
| 14/1 | 15.00 | +1400 | 6.7% |
| 15/1 | 16.00 | +1500 | 6.3% |
| 20/1 | 21.00 | +2000 | 4.8% |
| 25/1 | 26.00 | +2500 | 3.8% |
| 33/1 | 34.00 | +3300 | 2.9% |
| 40/1 | 41.00 | +4000 | 2.4% |
| 50/1 | 51.00 | +5000 | 2% |
| 66/1 | 67.00 | +6600 | 1.5% |
| 80/1 | 81.00 | +8000 | 1.2% |
| 100/1 | 101.00 | +10000 | 1% |
Frequently Asked Questions (FAQs)
An odds converter is a tool that changes betting odds between different formats like decimal, fractional, and moneyline, and calculates implied probability.
Implied probability helps you determine whether a bet offers good value by comparing the bookmaker’s odds to the actual chance of the outcome.
Yes, our odds converter is 100% free, accurate and available on both desktop and mobile devices.