Enter fractional odds like 1/2, 10/11, 3/2, or evens to convert the price into implied probability, American odds, decimal odds, profit, and total payout.
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Convert the line once, then move into fair-price, Kelly sizing, Expected Value Calculator, or hedge math without re-entering the core numbers.
Manual inputs only. No automated odds lookup or automatic bet placement was used.
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The stake field turns this converter into a moneyline payout calculator: profit is stake times net odds, while total payout includes your original stake.
Implied Probability Calculator
Convert American, decimal, or fractional odds into implied probability, then check the same line against profit and payout from your stake.
American Odds to Implied Probability Calculator
Enter American odds like -200, -110, or +150 to convert the moneyline into implied probability, decimal odds, fractional odds, profit, and total payout.
Expected Value Calculator
Enter sportsbook odds, your estimated win probability, and stake to model EV dollars, ROI, edge, fair odds, payout, and Kelly sizing.
Odds Converter
Convert American, decimal, fractional, and implied probability odds, then see profit and total payout from your stake.
For informational and educational purposes only. Not financial or gambling advice. All calculations assume odds remain constant and bets execute as entered. Actual results may vary. Gambling involves risk of loss.
A fractional odds to implied probability calculator converts profit-to-stake fractional prices into the break-even chance behind the bet. It is useful for horse racing, UK-style odds boards, and comparing fractional prices against US or decimal odds.
Decimal Odds = (Numerator / Denominator) + 1; Implied Probability = 1 / Decimal OddsConvert the fraction to decimal odds by dividing numerator by denominator and adding 1, then divide 1 by the decimal odds. Fractional 1/2 becomes decimal 1.50, so implied probability is 66.67%.
1/2 converts to decimal 1.50. Divide 1 by 1.50 to get 66.67% implied probability.
3/2 converts to decimal 2.50. Divide 1 by 2.50 to get 40.00% implied probability.
Yes. Evens means fractional 1/1, decimal 2.00, American +100, and 50.00% implied probability.
Implied Probability
The probability of an outcome as implied by the betting odds, including the bookmaker's margin.
Moneyline
A bet on which team or player will win a game outright, with no point spread.
Vig (Vigorish)
The commission a sportsbook charges on a bet, built into the odds.
True Odds
The actual mathematical probability of an outcome, without any bookmaker margin.
Expected Value (EV)
The average amount you can expect to win or lose per bet over time.
No-Vig Odds
The true fair odds after removing the sportsbook's built-in margin.
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