Odds Converter
Convert between American, decimal, fractional, and implied probability odds. Type in any format. The rest update instantly.
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Start Your Free TrialUnderstanding Betting Odds Formats
Sportsbooks display odds in different formats depending on the market. American books use moneyline (+150, -110). European books use decimals (2.50, 1.91). UK books use fractions (3/2, 10/11). They all represent the same thing: how much you stand to win and the implied probability of the outcome.
Knowing how to read all three formats is essential if you shop lines across multiple books. A -110 American line is the same as 1.91 decimal or 10/11 fractional. But the math is annoying to do in your head, especially in the middle of comparing lines at different sportsbooks. That's what this converter is for.
American Odds (Moneyline)
American odds center around $100. A positive number like +150 tells you how much you'd profit on a $100 bet ($150 in this case). A negative number like -150 tells you how much you need to bet to profit $100. Favorites are negative. Underdogs are positive.
+150 → Bet $100, profit $150 (total return $250)
-150 → Bet $150, profit $100 (total return $250)
+100 → Even money (bet $100, profit $100)
Decimal Odds
Decimal odds represent your total return per dollar wagered, including your original stake. To calculate your payout, just multiply your stake by the decimal odds. A 2.50 decimal odd on a $40 bet returns $100 total ($60 profit + $40 stake). Decimal odds below 2.00 represent a favorite; above 2.00 is an underdog.
Fractional Odds
Fractional odds show your profit relative to your stake. At 3/2, you profit $3 for every $2 wagered. At 1/4, you profit $1 for every $4 wagered (a heavy favorite). Fractions where the top number is bigger than the bottom represent underdogs. If the top is smaller, it's a favorite.
Implied Probability
Every set of odds implies a win probability. At -110, the sportsbook is pricing the outcome at 52.38%. The book builds margin (vig) on top, so the true probability is slightly lower. Understanding implied probability helps you spot lines where your research disagrees with the market. If you think a team has a 60% chance to cover and the odds imply 52%, you're looking at a positive expected value bet.
Quick Conversion Reference
| American | Decimal | Fractional | Implied Prob. |
|---|---|---|---|
| -200 | 1.50 | 1/2 | 66.67% |
| -150 | 1.67 | 2/3 | 60.00% |
| -110 | 1.91 | 10/11 | 52.38% |
| +100 | 2.00 | 1/1 | 50.00% |
| +150 | 2.50 | 3/2 | 40.00% |
| +200 | 3.00 | 2/1 | 33.33% |
| +500 | 6.00 | 5/1 | 16.67% |
Frequently Asked Questions
What's the difference between American and decimal odds?
American odds use +/- notation relative to $100. Decimal odds show your total return per $1. They convey the same information in different formats. American is standard in the U.S., decimal is standard everywhere else. Decimal is easier for quick mental math: just multiply by your stake.
How do I convert negative American odds to decimal?
Divide 100 by the absolute value of the American odds, then add 1. For -150: 100 ÷ 150 = 0.667, plus 1 = 1.667 decimal. For positive American odds: divide by 100 and add 1. For +200: 200 ÷ 100 = 2, plus 1 = 3.00 decimal.
What does implied probability tell me?
Implied probability is the break-even win rate built into the odds. If a line is priced at -110 (52.38% implied), you need to win more than 52.38% of the time at those odds to profit long-term. Comparing your own estimated probability to the implied probability is the foundation of value betting.
Why do both sides of a bet add up to more than 100%?
That's the vig (or juice), the sportsbook's margin. At -110 on both sides, implied probabilities total 104.76%. The extra 4.76% is what the book makes. Use our vig calculator to see exactly how much the book is charging on any line.
Which odds format is best for comparing lines?
Decimal is the easiest format for quick comparison because higher is always better. With American odds, you have to mentally process whether -105 is better than -110 (it is) and whether +145 is better than +150 (it's not). Decimal removes that friction: 1.952 vs 1.909 is obvious at a glance.
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