Odds Converter - American, Decimal & Fractional
Free odds converter for sports betting. Instantly convert between American, Decimal, and Fractional odds formats. See implied probability for any betting odds.
Understanding Betting Odds Formats
American Odds: Used primarily in the US. Negative numbers show how much you need to bet to win $100, positive numbers show how much you win on a $100 bet.
Decimal Odds: Popular in Europe and Australia. Simply multiply your stake by the decimal to get your total payout. Easier for calculating parlay payouts.
Fractional Odds: Traditional UK format. The fraction shows profit relative to stake (e.g., 5/1 means win $5 for every $1 bet).
Use our bet payout calculator to see exact winnings, or our implied probability calculator for detailed probability analysis.
How to Use This Calculator
- 1Enter Your Odds: Input odds in any format - American (-110), Decimal (1.91), or Fractional (10/11)
- 2View Conversions: All other formats update automatically as you type
- 3Check Probability: See the implied probability percentage for your odds
Frequently Asked Questions
How do I convert American odds to decimal?
For positive American odds: Decimal = (American/100) + 1. For negative: Decimal = (100/|American|) + 1. Example: +150 = 2.50 decimal, -150 = 1.67 decimal.
What is the difference between American and decimal odds?
American odds show profit relative to $100 (e.g., -110 means bet $110 to win $100). Decimal odds show total return per $1 bet (e.g., 1.91 returns $1.91 total). Decimal odds are simpler for calculating payouts.
How do fractional odds work?
Fractional odds show profit relative to stake. 5/1 means you win $5 for every $1 bet. 1/5 means you win $1 for every $5 bet. Common in UK horse racing and traditional sportsbooks.
What does implied probability mean in betting?
Implied probability is the win percentage suggested by the odds. It represents the break-even point. At -110 odds (52.4% implied), you need to win more than 52.4% of bets to profit long-term.
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Responsible Gambling
Gambling should be entertaining, not a way to make money. Only bet what you can afford to lose, and never chase your losses.
- Betting more than you can afford to lose
- Chasing losses with bigger bets
- Lying to others about gambling habits