Sports Betting Calculator

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Sports Betting Odds Calculator

Calculate potential profits, total payouts, and implied win probability instantly.

American (+/-) Decimal (2.00) Fractional (1/1)
Potential Profit: $0.00
Total Payout: $0.00
Implied Probability: 0%

How to Use the Sports Betting Calculator

Understanding how betting odds work is crucial for any successful bettor. This calculator simplifies the process by converting various odds formats and showing you exactly how much you stand to win based on your stake.

1. American Odds (+/-)

Commonly used in the United States. Positive odds (+) indicate how much profit you make on a $100 bet. For example, +150 means you win $150 on a $100 wager. Negative odds (-) indicate how much you need to bet to win $100. For example, -110 means you must bet $110 to win $100.

2. Decimal Odds

Popular in Europe and Australia, decimal odds represent the total payout rather than just the profit. To find your total return, multiply your stake by the decimal number. (Example: $10 stake at 2.50 odds = $25.00 total payout).

3. Fractional Odds

Traditional in the UK, shown as 5/1 or 10/11. The first number is the potential profit, and the second number is the stake required to earn that profit. 5/1 means you win 5 units for every 1 unit wagered.

Implied Probability Explained

Implied probability is what the odds suggest the likelihood of an outcome is. If a team is +100 (Even money), the implied probability is 50%. If the probability you calculate is higher than the implied probability of the bookmaker, you may have found a "value bet."

Practical Example:

Imagine you want to bet $50 on an underdog with +240 American odds:

  • Wager: $50
  • Profit Calculation: $50 * (240 / 100) = $120
  • Total Payout: $120 (Profit) + $50 (Stake) = $170
  • Implied Probability: 100 / (240 + 100) = 29.41%
function calculateSportsBet() { var stake = parseFloat(document.getElementById('betAmount').value); var type = document.getElementById('oddsType').value; var oddsStr = document.getElementById('oddsValue').value.trim(); var profit = 0; var impliedProb = 0; if (isNaN(stake) || stake 0) { profit = stake * (oddsNum / 100); impliedProb = 100 / (oddsNum + 100); } else if (oddsNum < 0) { profit = stake / (Math.abs(oddsNum) / 100); impliedProb = Math.abs(oddsNum) / (Math.abs(oddsNum) + 100); } else { alert("American odds cannot be 0."); return; } } else if (type === "decimal") { var decOdds = parseFloat(oddsStr); if (isNaN(decOdds) || decOdds <= 1) { alert("Decimal odds must be greater than 1."); return; } profit = stake * (decOdds – 1); impliedProb = 1 / decOdds; } else if (type === "fractional") { if (oddsStr.indexOf('/') === -1) { var fracNum = parseFloat(oddsStr); if(isNaN(fracNum)) return; profit = stake * fracNum; impliedProb = 1 / (fracNum + 1); } else { var parts = oddsStr.split('/'); var num = parseFloat(parts[0]); var den = parseFloat(parts[1]); if (isNaN(num) || isNaN(den) || den === 0) { alert("Invalid fractional format."); return; } profit = stake * (num / den); impliedProb = den / (num + den); } } var payout = stake + profit; var probPercent = impliedProb * 100; document.getElementById('resProfit').innerText = "$" + profit.toFixed(2); document.getElementById('resPayout').innerText = "$" + payout.toFixed(2); document.getElementById('resProb').innerText = probPercent.toFixed(2) + "%"; document.getElementById('sb-result-container').style.display = "block"; }

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