Sports Odds Calculator
Use this calculator to convert between different sports odds formats (Decimal, Fractional, Moneyline) and determine the implied probability of an outcome, as well as your potential payout and profit based on your stake.
Understanding Sports Odds
Sports odds are a numerical representation of the likelihood of a particular outcome in a sporting event. They also determine the potential payout you would receive if your bet is successful. Understanding how to read and convert different odds formats is crucial for any sports bettor.
Types of Odds Formats
-
Decimal Odds (European Odds): These are the most straightforward. A decimal odd of 2.50 means that for every $1 you stake, you will receive $2.50 back, including your original stake. Your profit would be $1.50.
Formula: Payout = Stake × Decimal Odds
Implied Probability = 1 / Decimal Odds
-
Fractional Odds (UK Odds): Commonly used in the UK and Ireland, fractional odds like 5/2 (read as "five to two") indicate the profit relative to your stake. For every $2 you stake, you would win $5 profit. Your total payout would be $7 ($5 profit + $2 stake).
Formula: Payout = Stake × ((Numerator / Denominator) + 1)
Implied Probability = Denominator / (Numerator + Denominator)
-
Moneyline Odds (American Odds): Predominantly used in the United States, Moneyline odds are displayed with a plus (+) or minus (-) sign.
- Positive Moneyline (+): Indicates how much profit you would win on a $100 stake. For example, +150 means a $100 stake would yield $150 profit, for a total payout of $250.
- Negative Moneyline (-): Indicates how much you need to stake to win $100 profit. For example, -200 means you need to stake $200 to win $100 profit, for a total payout of $300.
Formula for Positive (+): Payout = Stake × ((Moneyline / 100) + 1)
Formula for Negative (-): Payout = Stake × ((100 / |Moneyline|) + 1)
Implied Probability for Positive (+): 100 / (Moneyline + 100)
Implied Probability for Negative (-): |Moneyline| / (|Moneyline| + 100)
What is Implied Probability?
Implied probability is the conversion of betting odds into a percentage that represents the bookmaker's assessment of the likelihood of an event occurring. It's important to note that implied probability often includes the bookmaker's "vig" or "juice" (their profit margin), so the sum of implied probabilities for all outcomes in an event will typically exceed 100%.
How to Use the Calculator
- Enter Odds Value: Input the odds you want to convert (e.g., "2.50", "5/2", "+150", "-200").
- Select Odds Format: Choose the format of the odds you entered from the dropdown menu.
- Enter Your Stake (Optional): Input the amount of money you plan to bet to see your potential payout and profit.
- Click "Calculate Odds": The calculator will instantly display the odds in all three formats, the implied probability, and your potential returns.
Examples
- Example 1: Decimal Odds
If you enter "2.50" as Decimal Odds with a stake of $100:
- Decimal Odds: 2.50
- Fractional Odds: 3/2
- Moneyline Odds: +150
- Implied Probability: 40.00%
- Potential Payout: $250.00
- Potential Profit: $150.00
- Example 2: Fractional Odds
If you enter "5/2" as Fractional Odds with a stake of $50:
- Decimal Odds: 3.50
- Fractional Odds: 5/2
- Moneyline Odds: +250
- Implied Probability: 28.57%
- Potential Payout: $175.00
- Potential Profit: $125.00
- Example 3: Moneyline Odds
If you enter "-200" as Moneyline Odds with a stake of $200:
- Decimal Odds: 1.50
- Fractional Odds: 1/2
- Moneyline Odds: -200
- Implied Probability: 66.67%
- Potential Payout: $300.00
- Potential Profit: $100.00
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function calculateOdds() {
var oddsValueInput = document.getElementById("oddsValue").value.trim();
var oddsFormat = document.getElementById("oddsFormat").value;
var stakeAmountInput = document.getElementById("stakeAmount").value;
var decimalOdds = 0;
var impliedProbability = 0;
var stake = parseFloat(stakeAmountInput);
document.getElementById("resultDecimal").textContent = "";
document.getElementById("resultFractional").textContent = "";
document.getElementById("resultMoneyline").textContent = "";
document.getElementById("resultProbability").textContent = "";
document.getElementById("resultPayout").textContent = "";
document.getElementById("resultProfit").textContent = "";
if (!oddsValueInput) {
alert("Please enter an Odds Value.");
return;
}
if (oddsFormat === "decimal") {
decimalOdds = parseFloat(oddsValueInput);
if (isNaN(decimalOdds) || decimalOdds <= 1) {
alert("Invalid Decimal Odds. Must be a number greater than 1.");
return;
}
} else if (oddsFormat === "fractional") {
var parts = oddsValueInput.split('/');
if (parts.length !== 2) {
alert("Invalid Fractional Odds format. Use N/D (e.g., 5/2).");
return;
}
var numerator = parseFloat(parts[0]);
var denominator = parseFloat(parts[1]);
if (isNaN(numerator) || isNaN(denominator) || denominator === 0 || numerator < 0 || denominator 0) {
decimalOdds = (moneyline / 100) + 1;
} else {
decimalOdds = (100 / Math.abs(moneyline)) + 1;
}
}
if (decimalOdds > 0) {
impliedProbability = (1 / decimalOdds) * 100;
} else {
impliedProbability = 0;
}
var resultDecimal = decimalOdds.toFixed(2);
var fractionalNumerator = decimalOdds – 1;
var fractionalDenominator = 1;
var tolerance = 1.0E-6;
for (var d = 1; d <= 1000; d++) {
var n = fractionalNumerator * d;
if (Math.abs(n – Math.round(n)) = 2.00) {
resultMoneyline = "+" + ((decimalOdds – 1) * 100).toFixed(0);
} else if (decimalOdds > 1) {
resultMoneyline = "-" + (100 / (decimalOdds – 1)).toFixed(0);
} else {
resultMoneyline = "N/A";
}
var potentialPayout = 0;
var potentialProfit = 0;
if (!isNaN(stake) && stake >= 0) {
potentialPayout = stake * decimalOdds;
potentialProfit = potentialPayout – stake;
document.getElementById("resultPayout").textContent = "$" + potentialPayout.toFixed(2);
document.getElementById("resultProfit").textContent = "$" + potentialProfit.toFixed(2);
} else {
document.getElementById("resultPayout").textContent = "N/A (Invalid Stake)";
document.getElementById("resultProfit").textContent = "N/A (Invalid Stake)";
}
document.getElementById("resultDecimal").textContent = resultDecimal;
document.getElementById("resultFractional").textContent = resultFractional;
document.getElementById("resultMoneyline").textContent = resultMoneyline;
document.getElementById("resultProbability").textContent = impliedProbability.toFixed(2) + "%";
}
window.onload = function() {
calculateOdds();
};