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Instantly convert betting odds between decimal, fractional, and American formats. Enter your odds below and see the conversion in real time. Perfect for comparing bookmakers and making smarter bets.
Understanding odds formats is one of the most fundamental skills in sports betting. Whether you're comparing lines across bookmakers or calculating your potential payout, knowing how to convert between decimal, fractional, and American (moneyline) odds is essential. Our free converter does the math instantly.
Different regions of the world adopted their own systems for expressing probability and payouts:
While our tool does this automatically, understanding the formulas helps you think about odds more intuitively:
Subtract 1 from the decimal odds, then express as a fraction. Example: 3.00 → 3.00 - 1 = 2/1.
If decimal odds are 2.00 or higher: American = (Decimal - 1) × 100. Example: 2.50 → +150.
If decimal odds are below 2.00: American = -100 / (Decimal - 1). Example: 1.50 → -200.
Divide the fraction and add 1. Example: 5/2 → (5 ÷ 2) + 1 = 3.50.
Every set of odds implies a probability of that outcome occurring. This is critical for finding value bets — situations where you believe the true probability is higher than what the odds suggest.
The formula is simple: Implied Probability = 1 / Decimal Odds × 100.
If you think a team has a 60% chance of winning but the bookmaker's odds imply only 50%, that's a value bet worth considering.
Different bookmakers often offer slightly different odds on the same event. Over hundreds of bets, always taking the best available price compounds into significantly higher returns. This practice — known as line shopping — is one of the simplest ways to improve your long-term profitability.
Use our converter to quickly standardize odds from different bookmakers into a single format, making comparison effortless.
Decimal odds are widely considered the most intuitive because the number directly represents your total return. If you see 2.50, you know a €1 bet returns €2.50. No extra calculation needed.
Even money means the payout equals your stake — you double your money if you win. It's expressed as 2.00 (decimal), 1/1 or "evens" (fractional), or +100 (American). The implied probability is exactly 50%.
Each bookmaker sets odds based on their own risk models, market exposure, and margin strategy. These differences create opportunities for bettors to find better value by comparing prices before placing a bet.
The margin is how bookmakers guarantee profit. If you add up the implied probabilities of all outcomes in a market, they'll total more than 100% — the excess is the bookmaker's margin. Lower margins mean better odds for you. Typical margins range from 2-5% for major markets.
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