Betting Odds Calculator
Use this calculator to convert between different odds formats (Decimal, Fractional, Moneyline), calculate implied probability, and determine potential payouts for your bets.
Your Stake ($):
Enter Odds (Choose ONE format):
Decimal Odds:
Fractional Odds (Numerator):
Fractional Odds (Denominator):
Moneyline Odds:
Calculate Odds
Understanding Betting Odds
Betting odds are a numerical representation of the likelihood of an event occurring and determine the potential payout for a winning bet. They are fundamental to sports betting and come in various formats, each preferred in different regions or by different bookmakers.
Types of Betting Odds
Decimal Odds (European Odds): Widely used in Europe, Canada, and Australia. They represent the total return for every $1 staked, including your original stake. For example, odds of 2.50 mean a $10 bet would return $25 ($10 stake + $15 profit).Fractional Odds (UK Odds): Popular in the UK and Ireland. They represent the profit relative to your stake. For example, odds of 5/2 mean for every $2 staked, you would win $5 profit, plus your original $2 stake back, totaling $7.Moneyline Odds (American Odds): Predominant in the United States. They are displayed with a plus (+) or minus (-) sign.
Positive Moneyline (+): Indicates how much profit you would win on a $100 bet. E.g., +150 means a $100 bet wins $150 profit.Negative Moneyline (-): Indicates how much you need to bet to win $100 profit. E.g., -200 means you need to bet $200 to win $100 profit.
Implied Probability
Implied probability is the bookmaker's assessment of the likelihood of an event happening, expressed as a percentage. It's calculated directly from the odds. For example, decimal odds of 2.00 imply a 50% chance (1/2.00). Understanding implied probability helps you compare your own assessment of an event's likelihood against the bookmaker's, identifying potential value bets.
Potential Payout and Profit
The potential payout is the total amount you receive back if your bet wins, which includes your original stake. Potential profit is the payout minus your original stake. Our calculator helps you quickly determine these figures across different odds formats.
How to Use the Calculator
Enter Your Stake: Input the amount of money you wish to bet.Choose ONE Odds Format: Enter the odds in either Decimal, Fractional (Numerator and Denominator), or Moneyline format. Do not fill in more than one odds type.Click "Calculate Odds": The calculator will then display the converted odds in all formats, the implied probability, your potential payout, and your potential profit.
Examples
Let's say you want to place a $50 bet:
Decimal Odds: 2.50
Implied Probability: (1 / 2.50) * 100% = 40%
Potential Payout: $50 * 2.50 = $125.00
Potential Profit: $125.00 – $50 = $75.00
Fractional Odds: 5/2
Implied Probability: (2 / (5 + 2)) * 100% = 28.57%
Potential Payout: $50 * ((5 / 2) + 1) = $50 * 3.5 = $175.00
Potential Profit: $50 * (5 / 2) = $125.00
Moneyline Odds: +150
Implied Probability: (100 / (150 + 100)) * 100% = 40%
Potential Payout: $50 * ((150 / 100) + 1) = $50 * 2.5 = $125.00
Potential Profit: $50 * (150 / 100) = $75.00
Moneyline Odds: -200
Implied Probability: (200 / (200 + 100)) * 100% = 66.67%
Potential Payout: $50 * ((100 / 200) + 1) = $50 * 1.5 = $75.00
Potential Profit: $50 * (100 / 200) = $25.00
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function calculateOdds() {
var stake = parseFloat(document.getElementById('stakeAmount').value);
var decimalOddsInput = document.getElementById('decimalOdds').value;
var fractionalNumeratorInput = document.getElementById('fractionalNumerator').value;
var fractionalDenominatorInput = document.getElementById('fractionalDenominator').value;
var moneylineOddsInput = document.getElementById('moneylineOdds').value;
var resultDiv = document.getElementById('oddsResult');
resultDiv.innerHTML = "; // Clear previous results
if (isNaN(stake) || stake <= 0) {
resultDiv.innerHTML = 'Please enter a valid stake amount greater than 0.';
return;
}
var decimalOdds = 0;
var fractionalNumerator = 0;
var fractionalDenominator = 0;
var moneylineOdds = 0;
var oddsTypeEntered = '';
// Determine which odds type was entered
if (decimalOddsInput !== '') {
decimalOdds = parseFloat(decimalOddsInput);
if (isNaN(decimalOdds) || decimalOdds 1.0 for profit
resultDiv.innerHTML = 'Please enter valid Decimal Odds (e.g., 2.50, must be ≥ 1.01).';
return;
}
oddsTypeEntered = 'decimal';
} else if (fractionalNumeratorInput !== " && fractionalDenominatorInput !== ") {
fractionalNumerator = parseInt(fractionalNumeratorInput);
fractionalDenominator = parseInt(fractionalDenominatorInput);
if (isNaN(fractionalNumerator) || isNaN(fractionalDenominator) || fractionalNumerator < 0 || fractionalDenominator <= 0) { // Numerator can be 0 for even money
resultDiv.innerHTML = 'Please enter valid positive integers for Fractional Odds (e.g., 5/2). Denominator must be positive.';
return;
}
oddsTypeEntered = 'fractional';
} else if (moneylineOddsInput !== '') {
moneylineOdds = parseInt(moneylineOddsInput);
if (isNaN(moneylineOdds) || moneylineOdds === 0) {
resultDiv.innerHTML = 'Please enter valid Moneyline Odds (e.g., +150 or -200, cannot be 0).';
return;
}
oddsTypeEntered = 'moneyline';
} else {
resultDiv.innerHTML = 'Please enter odds in one of the formats (Decimal, Fractional, or Moneyline).';
return;
}
var calculatedDecimalOdds = 0;
var calculatedFractionalNumerator = 0;
var calculatedFractionalDenominator = 0;
var calculatedMoneylineOdds = 0;
var impliedProbability = 0;
var potentialPayout = 0;
var potentialProfit = 0;
// Perform calculations based on the entered odds type
if (oddsTypeEntered === 'decimal') {
calculatedDecimalOdds = decimalOdds;
impliedProbability = (1 / calculatedDecimalOdds) * 100;
potentialPayout = stake * calculatedDecimalOdds;
potentialProfit = potentialPayout – stake;
// Convert to Fractional
var fractionalValue = calculatedDecimalOdds – 1;
if (Math.abs(fractionalValue) < 0.0001) { // If decimal odds are 1.00 (even money)
calculatedFractionalNumerator = 0;
calculatedFractionalDenominator = 1;
} else {
var tolerance = 0.0001; // For floating point comparison
var maxDenominator = 1000; // Limit for reasonable fractions
for (var d = 1; d <= maxDenominator; d++) {
var n = fractionalValue * d;
if (Math.abs(n – Math.round(n)) = 2.00) {
calculatedMoneylineOdds = (calculatedDecimalOdds – 1) * 100;
} else {
calculatedMoneylineOdds = -100 / (calculatedDecimalOdds – 1);
}
} else if (oddsTypeEntered === 'fractional') {
calculatedDecimalOdds = (fractionalNumerator / fractionalDenominator) + 1;
impliedProbability = (fractionalDenominator / (fractionalNumerator + fractionalDenominator)) * 100;
potentialProfit = stake * (fractionalNumerator / fractionalDenominator);
potentialPayout = stake + potentialProfit;
calculatedFractionalNumerator = fractionalNumerator;
calculatedFractionalDenominator = fractionalDenominator;
// Convert to Moneyline
if (calculatedDecimalOdds >= 2.00) {
calculatedMoneylineOdds = (calculatedDecimalOdds – 1) * 100;
} else {
calculatedMoneylineOdds = -100 / (calculatedDecimalOdds – 1);
}
} else if (oddsTypeEntered === 'moneyline') {
if (moneylineOdds > 0) { // Positive Moneyline (+150)
calculatedDecimalOdds = (moneylineOdds / 100) + 1;
impliedProbability = (100 / (moneylineOdds + 100)) * 100;
potentialProfit = stake * (moneylineOdds / 100);
} else { // Negative Moneyline (-200)
calculatedDecimalOdds = (100 / Math.abs(moneylineOdds)) + 1;
impliedProbability = (Math.abs(moneylineOdds) / (Math.abs(moneylineOdds) + 100)) * 100;
potentialProfit = stake * (100 / Math.abs(moneylineOdds));
}
potentialPayout = stake + potentialProfit;
calculatedMoneylineOdds = moneylineOdds;
// Convert to Fractional
var fractionalValue = calculatedDecimalOdds – 1;
if (Math.abs(fractionalValue) < 0.0001) { // If decimal odds are 1.00 (even money)
calculatedFractionalNumerator = 0;
calculatedFractionalDenominator = 1;
} else {
var tolerance = 0.0001;
var maxDenominator = 1000;
for (var d = 1; d <= maxDenominator; d++) {
var n = fractionalValue * d;
if (Math.abs(n – Math.round(n)) 0) {
moneylineDisplay = '+' + calculatedMoneylineOdds.toFixed(0);
} else if (calculatedMoneylineOdds = 0 && calculatedFractionalDenominator > 0) {
fractionalDisplay = calculatedFractionalNumerator + '/' + calculatedFractionalDenominator;
} else {
fractionalDisplay = 'N/A'; // For cases where conversion is difficult or odds are too low
}
resultDiv.innerHTML =
'
Your Stake: $' + stake.toFixed(2) + " +
'
Decimal Odds: ' + calculatedDecimalOdds.toFixed(2) + " +
'
Fractional Odds: ' + fractionalDisplay + " +
'
Moneyline Odds: ' + moneylineDisplay + " +
'
Implied Probability: ' + impliedProbability.toFixed(2) + '%' +
'
Potential Payout: $' + potentialPayout.toFixed(2) + " +
'
Potential Profit: $' + potentialProfit.toFixed(2) + ";
}