Betting Payout & Probability Calculator
Use this calculator to determine your potential payout, net winnings, and the implied probability of an event based on your stake and the odds offered. It supports Decimal, Fractional, and American odds formats.
Understanding Betting Odds and Payouts
Betting odds are a numerical representation of the likelihood of an event occurring and determine the potential payout for a winning bet. Different regions and bookmakers use various formats, but they all convey the same information: how much you stand to win relative to your stake.
Types of Odds:
- Decimal Odds (European Odds): These are common 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 $100 stake would return $250 ($100 stake + $150 winnings).
- Fractional Odds (UK Odds): Popular in the UK and Ireland, these odds show the profit relative to your stake. For example, odds of 5/2 (read as "five to two") mean you win $5 for every $2 staked. A $100 stake at 5/2 would yield $250 in winnings, plus your original $100 stake back, for a total payout of $350.
- American Odds (Moneyline Odds): Predominant in the United States, these odds are displayed with a plus (+) or minus (-) sign.
- Positive Odds (+): Indicate how much profit you would make on a $100 stake. E.g., +200 means a $100 bet wins $200 profit.
- Negative Odds (-): Indicate how much you need to stake to win $100 profit. E.g., -150 means you need to bet $150 to win $100 profit.
How the Calculator Works:
Our Betting Payout & Probability Calculator simplifies the process of understanding your potential returns. Simply enter your desired stake amount, select the odds format, and input the odds value. The calculator will instantly provide:
- Potential Payout: The total amount you would receive back if your bet wins, including your original stake.
- Net Winnings: The profit you would make from a winning bet, excluding your original stake.
- Implied Probability: The statistical likelihood of the event occurring, as suggested by the odds. This is useful for identifying value bets – if you believe the actual probability of an event is higher than the implied probability, it might be a good bet.
Examples:
Let's look at some practical examples using a $100 stake:
- Decimal Odds (2.50):
- Stake: $100
- Odds: 2.50
- Potential Payout: $250.00
- Net Winnings: $150.00
- Implied Probability: 40.00%
- Fractional Odds (5/2):
- Stake: $100
- Odds: 5/2
- Potential Payout: $350.00
- Net Winnings: $250.00
- Implied Probability: 28.57%
- American Odds (+200):
- Stake: $100
- Odds: +200
- Potential Payout: $300.00
- Net Winnings: $200.00
- Implied Probability: 33.33%
- American Odds (-150):
- Stake: $100
- Odds: -150
- Potential Payout: $166.67
- Net Winnings: $66.67
- Implied Probability: 60.00%
Using this calculator can help you quickly assess the value and potential returns of your bets across different odds formats, making you a more informed bettor.
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function updateOddsPlaceholder() {
var oddsType = document.getElementById("oddsType").value;
var oddsValueInput = document.getElementById("oddsValue");
switch (oddsType) {
case "decimal":
oddsValueInput.placeholder = "e.g., 2.50";
oddsValueInput.value = "2.50";
break;
case "fractional":
oddsValueInput.placeholder = "e.g., 5/2 or 5:2";
oddsValueInput.value = "5/2";
break;
case "american":
oddsValueInput.placeholder = "e.g., +200 or -150";
oddsValueInput.value = "+200";
break;
}
}
function calculateBettingPayout() {
var stakeAmount = parseFloat(document.getElementById("stakeAmount").value);
var oddsType = document.getElementById("oddsType").value;
var oddsValueStr = document.getElementById("oddsValue").value;
var resultDiv = document.getElementById("bettingResult");
if (isNaN(stakeAmount) || stakeAmount <= 0) {
resultDiv.innerHTML = "Please enter a valid stake amount (a positive number).";
return;
}
var payout = 0;
var winnings = 0;
var impliedProbability = 0;
var oddsValid = true;
try {
if (oddsType === "decimal") {
var decimalOdds = parseFloat(oddsValueStr);
if (isNaN(decimalOdds) || decimalOdds < 1) {
oddsValid = false;
throw new Error("Invalid Decimal Odds. Must be 1 or greater.");
}
payout = stakeAmount * decimalOdds;
winnings = payout – stakeAmount;
impliedProbability = (1 / decimalOdds) * 100;
} else if (oddsType === "fractional") {
var parts = oddsValueStr.split(/[\/: ]+/); // Split by /, :, or space
if (parts.length !== 2) {
oddsValid = false;
throw new Error("Invalid Fractional Odds. Use format like '5/2' or '5:2'.");
}
var numerator = parseFloat(parts[0]);
var denominator = parseFloat(parts[1]);
if (isNaN(numerator) || isNaN(denominator) || denominator 0) { // Positive American Odds (+200)
payout = stakeAmount * (americanOdds / 100 + 1);
winnings = stakeAmount * (americanOdds / 100);
impliedProbability = (100 / (americanOdds + 100)) * 100;
} else { // Negative American Odds (-150)
payout = stakeAmount * (100 / Math.abs(americanOdds) + 1);
winnings = stakeAmount * (100 / Math.abs(americanOdds));
impliedProbability = (Math.abs(americanOdds) / (Math.abs(americanOdds) + 100)) * 100;
}
}
} catch (e) {
resultDiv.innerHTML = "" + e.message + "";
return;
}
if (!oddsValid) {
return; // Error message already set by throw
}
resultDiv.innerHTML =
"
Potential Payout: $" + payout.toFixed(2) + "" +
"
Net Winnings: $" + winnings.toFixed(2) + "" +
"
Implied Probability: " + impliedProbability.toFixed(2) + "%";
}
// Initialize placeholder on load
window.onload = updateOddsPlaceholder;