American odds (Moneyline) are built around a $100 baseline, while UK Fractional odds represent the ratio of profit to stake. If you are a UK bettor looking at NFL or NBA lines, or a US bettor using a British sportsbook, you need a quick way to bridge the gap between +200/-150 and ratios like 2/1 or 4/6.
Use our American to Fractional Converter to translate US odds into the traditional fractional format instantly.
How to Use the Calculator
This tool performs a complex conversion by first identifying if the selection is a favorite or an underdog:
- Enter American Odds: Input the moneyline value (e.g., +150 for an underdog or -200 for a favorite).
- Automatic Fraction: The tool simplifies the math to the most common fraction (e.g., +150 becomes 3/2; -200 becomes 1/2).
- Check the Logic: Review the formula box to see the simplified ratio used to achieve the result.
Understanding the Payout
A fraction like 3/2 (read as “three-to-two”) means you win £3 for every £2 staked. This is identical to a US Moneyline of +150, where you win $150 for every $100 staked. The ratio remains the same regardless of the currency or amount.
Frequently Asked Questions (FAQ)
What is -110 in fractional odds?
The standard US “point spread” price of -110 converts to 10/11 in fractional odds. This is considered an “Odds On” price where the stake is slightly higher than the potential profit.
How do you convert positive American odds to fractions?
Simply divide the positive odds by 100 and reduce the fraction. For example, +300 becomes 300/100, which simplifies to 3/1.
Is fractional odds only used for horse racing?
While most famous in horse racing, fractional odds are the default format for all sports in the UK and Ireland. However, many modern bettors are switching to decimal odds for easier comparison.