Positive odds show profit on a $100 stake. Negative odds show how much you need to stake to win $100.
Betting odds calculator
Calculate payout, profit, and implied probability.
Enter American, decimal, or fractional odds to see what a bet can return before you commit the stake. The calculator is built for sports betting examples and general odds education.
Free calculator
Betting odds calculator
Convert a stake and odds into estimated profit, total payout, decimal odds, and implied probability.
Profit$90.91
Total payout$190.91
Decimal odds1.909
Implied probability52.38%
profit = stake x (decimal odds - 1)How it works
Betting odds are just payout math.
Odds show how much a sportsbook pays if the bet wins. The same price can be written as American odds, decimal odds, or fractional odds. This calculator converts each format into decimal odds first, then uses that number to estimate profit and total payout.
Decimal odds show total return per $1 staked. Profit is the decimal price minus the original stake.
Fractional odds show profit compared with stake. A 5/2 price pays $5 profit for every $2 staked.
Formulas
- Decimal from positive American odds: `1 + American / 100`.
- Decimal from negative American odds: `1 + 100 / abs(American)`.
- Profit: `stake x (decimal odds - 1)`.
- Total payout: `stake x decimal odds`.
- Implied probability: `1 / decimal odds x 100`.
Use it carefully
Calculator outputs are estimates for education and comparison. Sportsbooks can apply different rules for pushes, voids, dead heats, cashout, promotions, parlays, or free bets. Always confirm the final price and settlement rules before wagering.
Want fair odds?
If you are comparing both sides of a market, use the no-vig fair odds calculator to remove sportsbook margin and see normalized prices.