Odds Calculator | Convert, Probability & Payout

Convert decimal, fractional, and American odds. Instantly calculate implied probability, profit, and payouts with our free odds calculator.

Enter Your Odds

Decimal Odds

Fractional Odds

American (Moneyline) Odds (e.g., +150 or -200)

Enter Stake (Optional)

Implied Probability

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This is the likelihood of the outcome succeeding, according to the odds.

Potential Payout

Profit

$0.00

Total Return

$0.00

Odds represent the likelihood of an event, but are expressed differently worldwide.

This calculator helps translate between the three major formats to find the best value.

Decimal Odds: Common in Europe, Australia, and Canada. The number represents the total return for every $1 staked, including the original stake. A $10 bet at 3.0 decimal odds returns $30 ($20 profit + $10 stake).
Fractional Odds: Popular in the UK and Ireland. The fraction shows the potential profit relative to the stake. A $10 bet at 5/2 fractional odds means you would profit $25 ($10 * 5/2) for a total return of $35.
American (Moneyline) Odds: Used primarily in the United States. They revolve around a baseline of $100. A positive number (+200) shows how much profit you win on a $100 stake. A negative number (-150) shows how much you must stake to win $100 in profit.

Implied probability is the chance of an outcome occurring as suggested by the odds.

It is the most important factor for a bettor, as it allows for an objective comparison of different betting opportunities. You can convert any odds format into a percentage to assess the risk and potential value.

For example, odds of 2.00 (decimal), 1/1 (fractional), or +100 (American) all translate to an implied probability of 50%. If you believe the true probability of that outcome is higher than 50%, the bet offers “value.”

Note: Bookmakers include a margin (vigorish or “vig”) in their odds, so the sum of probabilities for all outcomes in an event will be slightly over 100%. This is how they ensure a profit. This calculator does not adjust for bookmaker margin (‘vig’). If you want margin-free probabilities, normalize across all outcomes.

Calculating your potential return is key to managing your bankroll.

The calculation depends on the odds format, but this tool handles it automatically once you enter a stake.

Profit: The amount of money you win, not including your original stake.
Total Return (Payout): The full amount returned to you, which is your original stake plus your profit.
Using Decimal Odds: Total Return = Stake * Decimal Odds
Using Fractional Odds: Total Return = Stake * (Numerator / Denominator) + Stake
Using American Odds (Positive): Total Return = Stake * (American Odds / 100) + Stake
Using American Odds (Negative): Total Return = Stake * (100 / |-American Odds|) + Stake