Betting odds are a fundamental concept in sports betting and gambling. They represent the probability of a specific event happening and, more importantly for bettors, determine how much you can win if your bet is successful. Different regions and bookmakers use various formats for odds, but the underlying principle is the same: to calculate potential profit and payout. This calculator helps you quickly determine your potential winnings across different odds formats.
Common Odds Formats:
Decimal Odds: The most straightforward format, commonly used in Europe, Australia, and Canada. It represents the total return for every $1 staked. A decimal odd of 3.00 means you get back $3 for every $1 bet (including your original stake).
Fractional Odds: Predominantly used in the UK and Ireland. Fractions like 5/2 (five-to-two) mean that for every $2 you bet, you stand to win $5 profit. The total return would be your $5 profit plus your original $2 stake, totaling $7.
American Odds (Moneyline): Common in the United States. American odds are presented with a plus (+) or minus (-) sign.
Positive (+) Odds: Indicate the amount you would win for a $100 bet. For example, +250 means a $100 bet wins $250 profit.
Negative (-) Odds: Indicate the amount you must bet to win $100 profit. For example, -150 means you must bet $150 to win $100 profit.
How the Calculator Works:
This calculator takes your bet amount and the odds you provide in any of the three common formats. It then converts these odds internally to a consistent format (decimal) to perform the calculation.
Decimal Odds Calculation: Payout = Bet Amount * Decimal Odds Profit = Payout – Bet Amount
Fractional Odds Calculation: Profit = Bet Amount * (Numerator / Denominator) Payout = Profit + Bet Amount
American Odds Calculation:
If odds are positive (e.g., +200):
Profit = Bet Amount * (American Odds / 100) Payout = Profit + Bet Amount
If odds are negative (e.g., -150):
Profit = Bet Amount * (100 / Absolute Value of American Odds) Payout = Profit + Bet Amount
Example Usage:
Let's say you want to bet $50.
If Decimal Odds are 3.25: Your payout would be $50 * 3.25 = $162.50. Your profit is $162.50 – $50 = $112.50.
If Fractional Odds are 9/4: Your profit would be $50 * (9 / 4) = $112.50. Your total payout is $112.50 + $50 = $162.50.
If American Odds are +160: Your profit would be $50 * (160 / 100) = $80. Your total payout is $80 + $50 = $130.
If American Odds are -120: You need to bet $50 * (120 / 100) = $60 to win $50 profit. Your total payout would be $50 + $60 = $110.
Use this calculator to easily switch between formats and understand the potential returns on your bets, empowering you to make more informed decisions.
function showOddsInput() {
var oddsType = document.getElementById("oddsType").value;
document.getElementById("decimalOddsInput").style.display = "none";
document.getElementById("fractionalOddsInput").style.display = "none";
document.getElementById("americanOddsInput").style.display = "none";
if (oddsType === "decimal") {
document.getElementById("decimalOddsInput").style.display = "flex";
} else if (oddsType === "fractional") {
document.getElementById("fractionalOddsInput").style.display = "flex";
} else if (oddsType === "american") {
document.getElementById("americanOddsInput").style.display = "flex";
}
}
function calculateBet() {
var betAmount = parseFloat(document.getElementById("betAmount").value);
var oddsType = document.getElementById("oddsType").value;
var decimalOdds = 0;
var profit = 0;
var payout = 0;
var resultText = "";
if (isNaN(betAmount) || betAmount <= 0) {
resultText = "Invalid bet amount";
} else {
if (oddsType === "decimal") {
decimalOdds = parseFloat(document.getElementById("decimalOdds").value);
if (isNaN(decimalOdds) || decimalOdds < 1.01) {
resultText = "Invalid decimal odds";
} else {
payout = betAmount * decimalOdds;
profit = payout – betAmount;
resultText = "$" + payout.toFixed(2);
}
} else if (oddsType === "fractional") {
var numeratorStr = document.getElementById("fractionalNumerator").value;
var denominatorStr = document.getElementById("fractionalDenominator").value;
var numerator = parseFloat(numeratorStr);
var denominator = parseFloat(denominatorStr);
if (isNaN(numerator) || isNaN(denominator) || denominator === 0 || numerator <= 0 || denominator 0) {
profit = betAmount * (americanOdds / 100);
payout = profit + betAmount;
resultText = "$" + payout.toFixed(2);
} else { // American odds are negative
var absoluteAmericanOdds = Math.abs(americanOdds);
profit = betAmount * (100 / absoluteAmericanOdds);
payout = profit + betAmount;
resultText = "$" + payout.toFixed(2);
}
}
}
document.getElementById("calculationResult").textContent = resultText;
}
// Initial setup for odds input visibility
window.onload = showOddsInput;
document.getElementById("oddsType").onchange = showOddsInput;