Calculate your potential returns, profit, and implied probability across different odds formats.
Decimal (e.g. 2.50)
Fractional (e.g. 3/2)
American (e.g. +150)
Total Payout (Return):–
Total Profit:–
Implied Probability:–
How to Use the Betting Calculator
Understanding how much you stand to win on a wager is crucial for bankroll management. This betting calculator simplifies the process by converting various odds formats and calculating your net profit instantly. Whether you are betting on sports, horse racing, or financial markets, knowing your "Return on Investment" (ROI) is the first step toward becoming a disciplined bettor.
Understanding Odds Formats
Decimal Odds: Common in Europe and Australia. They represent the total return for every 1 unit staked. A 2.00 odd means you double your money (1 unit profit + 1 unit stake).
Fractional Odds: Traditional in the UK. The first number (numerator) is the potential profit, while the second (denominator) is the stake required. For example, 5/1 means you win 5 units for every 1 unit staked.
American Odds: Used primarily in the US. Positive numbers (+) indicate how much profit you make on a 100 stake. Negative numbers (-) indicate how much you need to stake to make 100 profit.
Real-World Example:
If you place a 100 stake on a team with American Odds of +150:
– Your Profit would be 150.
– Your Total Payout would be 250 (100 stake + 150 profit).
– The Implied Probability of this bet winning is 40%.
What is Implied Probability?
Implied probability is the conversion of betting odds into a percentage. It represents the likelihood of an outcome occurring as suggested by the bookmaker. If the actual probability of an event is higher than the implied probability, you have found a "Value Bet."
function updatePlaceholder() {
var format = document.getElementById('oddsFormat').value;
var input = document.getElementById('oddsValue');
if (format === 'decimal') {
input.placeholder = 'e.g. 2.50';
} else if (format === 'fractional') {
input.placeholder = 'e.g. 3/2';
} else {
input.placeholder = 'e.g. +150 or -110';
}
}
function calculateBet() {
var stake = parseFloat(document.getElementById('stakeAmount').value);
var oddsInput = document.getElementById('oddsValue').value.trim();
var format = document.getElementById('oddsFormat').value;
if (isNaN(stake) || stake <= 0 || oddsInput === "") {
alert("Please enter a valid stake and odds value.");
return;
}
var decimalOdds = 0;
var profit = 0;
var totalReturn = 0;
var impliedProb = 0;
try {
if (format === 'decimal') {
decimalOdds = parseFloat(oddsInput);
if (decimalOdds 0) {
decimalOdds = (american / 100) + 1;
} else if (american < 0) {
decimalOdds = (100 / Math.abs(american)) + 1;
} else {
throw "Error";
}
}
if (isNaN(decimalOdds) || decimalOdds <= 1) {
alert("Invalid odds value entered.");
return;
}
totalReturn = stake * decimalOdds;
profit = totalReturn – stake;
impliedProb = (1 / decimalOdds) * 100;
document.getElementById('totalReturn').innerHTML = totalReturn.toFixed(2);
document.getElementById('totalProfit').innerHTML = profit.toFixed(2);
document.getElementById('impliedProb').innerHTML = impliedProb.toFixed(2) + "%";
document.getElementById('bettingResults').style.display = 'block';
} catch (e) {
alert("Error calculating. Please check your odds format.");
}
}