Enter American odds like +150 or -200 to convert them into fractional odds, decimal odds, implied probability, profit, and total payout.
Use this odds result next
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.
The stake field turns this converter into a moneyline payout calculator: profit is stake times net odds, while total payout includes your original stake.
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Arbitrage Calculator
Enter prices from two or more outcomes, split your stake for equal payout, and see whether the market models positive value before execution risk.
No-Vig Calculator
Remove the vig to see true fair odds and probabilities.
Expected Value Calculator
Enter sportsbook odds, your estimated win probability, and stake to model EV dollars, ROI, edge, fair odds, payout, and Kelly sizing.
Kelly Criterion & Unit Size Calculator
Estimate bet size from an assumed edge (Kelly Criterion) or use flat unit sizing for bankroll management.
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.
An American to fractional odds converter translates US moneyline prices into profit-to-stake fractional format. Fractional odds are common in horse racing and UK-style odds boards.
Convert American odds to decimal odds; Fractional = Decimal - 1Convert American odds into decimal odds first, then subtract 1 and reduce the result to a fraction. American +150 becomes decimal 2.50, then fractional 3/2. American -200 becomes decimal 1.50, then fractional 1/2.
+150 converts to decimal 2.50. Subtract 1 to get 1.50, which reduces to fractional odds of 3/2.
-200 converts to decimal 1.50. Subtract 1 to get 0.50, which reduces to fractional odds of 1/2.
Fractional odds show profit relative to stake. Decimal odds show total payout, including the returned stake.
Moneyline
A bet on which team or player will win a game outright, with no point spread.
Implied Probability
The probability of an outcome as implied by the betting odds, including the bookmaker's margin.
True Odds
The actual mathematical probability of an outcome, without any bookmaker margin.
Vig (Vigorish)
The commission a sportsbook charges on a bet, built into the odds.
No-Vig Odds
The true fair odds after removing the sportsbook's built-in margin.
Expected Value (EV)
The average amount you can expect to win or lose per bet over time.