Enter your stake and odds to see potential returns.
Understanding Horse Race Betting & the Calculator
Horse race betting is a thrilling and popular form of wagering that involves predicting the outcome of a horse race. At its core, it's about placing a stake (your bet amount) on a particular horse to win, place, or fulfill other specific conditions, based on a set of odds. The odds represent the bookmaker's assessment of a horse's probability of winning and also determine the potential payout if your bet is successful.
Types of Odds
Our calculator supports the three most common types of odds:
Decimal Odds: These are the most straightforward. They represent the total amount you will receive for every unit staked if your bet wins, including your original stake. For example, decimal odds of 5.00 mean you get back 5 units for every 1 unit you bet.
Fractional Odds: Commonly used in the UK and Ireland, these are expressed as a fraction, like 4/1 (read as "four to one"). The first number is the profit you'll make relative to the second number (your stake). So, 4/1 means you win 4 units for every 1 unit staked, plus your original stake back.
American Odds: Predominantly used in the United States, these odds are presented with a plus (+) or minus (-) sign.
Positive Odds (+): Indicate the amount you would win on a 100 unit bet. For example, +200 means you win 200 units for a 100 unit bet.
Negative Odds (-): Indicate the amount you must bet to win 100 units. For example, -150 means you must bet 150 units to win 100 units.
How the Calculator Works
This calculator simplifies the process of understanding your potential returns. You need to provide:
Stake: The amount of money you are betting.
Odds Type: Select whether you are using Decimal, Fractional, or American odds.
Odds Value: Enter the specific odds for the horse you are betting on. The input fields will adjust based on your selected odds type.
Once you input these details and click "Calculate Payout & Profit," the calculator will instantly show you:
Total Payout: The total amount you will receive if your bet wins (including your original stake).
Net Profit: The amount you will win in addition to getting your stake back.
Mathematical Formulas Used:
Decimal Odds:
Total Payout = Stake × Decimal Odds
Net Profit = Total Payout – Stake
Fractional Odds (e.g., N/D):
Total Payout = Stake + (Stake × (Numerator / Denominator))
This calculator helps demystify betting odds and empowers you to quickly understand the potential outcomes of your wagers, making your betting experience more informed and enjoyable.
function calculateBet() {
var stakeInput = document.getElementById("stake");
var oddsTypeSelect = document.getElementById("oddsType");
var numeratorInput = document.getElementById("numerator");
var denominatorInput = document.getElementById("denominator");
var americanOddsInput = document.getElementById("americanOdds");
var resultDiv = document.getElementById("result-value");
var resultDescription = document.getElementById("result-description");
var stake = parseFloat(stakeInput.value);
var oddsType = oddsTypeSelect.value;
var totalPayout = 0;
var netProfit = 0;
var payoutDescription = "";
if (isNaN(stake) || stake <= 0) {
resultDiv.innerText = "Invalid";
resultDescription.innerText = "Please enter a valid stake amount.";
return;
}
if (oddsType === "decimal") {
var decimalOdds = parseFloat(document.getElementById("americanOdds").value); // Re-using americanOdds input for decimal
if (isNaN(decimalOdds) || decimalOdds < 1.01) { // Decimal odds must be at least 1.01
resultDiv.innerText = "Invalid";
resultDescription.innerText = "Please enter valid Decimal odds (e.g., 2.50).";
return;
}
totalPayout = stake * decimalOdds;
netProfit = totalPayout – stake;
payoutDescription = `Total Payout: $${totalPayout.toFixed(2)} | Net Profit: $${netProfit.toFixed(2)}`;
} else if (oddsType === "fractional") {
var numerator = parseFloat(numeratorInput.value);
var denominator = parseFloat(denominatorInput.value);
if (isNaN(numerator) || isNaN(denominator) || denominator <= 0 || numerator 0) {
totalPayout = stake + (stake * (americanOdds / 100));
netProfit = stake * (americanOdds / 100);
} else if (americanOdds < 0) {
totalPayout = stake + (stake * (100 / Math.abs(americanOdds)));
netProfit = stake * (100 / Math.abs(americanOdds));
} else { // Odds are 0, which is invalid
resultDiv.innerText = "Invalid";
resultDescription.innerText = "American odds cannot be zero.";
return;
}
payoutDescription = `Total Payout: $${totalPayout.toFixed(2)} | Net Profit: $${netProfit.toFixed(2)}`;
}
resultDiv.innerText = payoutDescription;
resultDescription.innerText = "Calculation successful!";
}
function resetCalculator() {
document.getElementById("stake").value = "";
document.getElementById("oddsType").value = "decimal";
document.getElementById("numerator").value = "";
document.getElementById("denominator").value = "";
document.getElementById("americanOdds").value = "";
document.getElementById("result-value").innerText = "–";
document.getElementById("result-description").innerText = "Enter your stake and odds to see potential returns.";
updateOddsInputs(); // Ensure inputs are shown/hidden correctly after reset
}
function updateOddsInputs() {
var oddsType = document.getElementById("oddsType").value;
var fractionalDiv = document.getElementById("fractionalOddsInput");
var americanDiv = document.getElementById("americanOddsInput");
if (oddsType === "fractional") {
fractionalDiv.style.display = "block";
americanDiv.style.display = "none";
// Clear american odds if switching away from it
document.getElementById("americanOdds").value = "";
} else if (oddsType === "american") {
fractionalDiv.style.display = "none";
americanDiv.style.display = "block";
// Clear fractional odds if switching away from it
document.getElementById("numerator").value = "";
document.getElementById("denominator").value = "";
} else { // Decimal
fractionalDiv.style.display = "none";
americanDiv.style.display = "block"; // For decimal, we use the american odds input field
// Clear fractional odds if switching away from it
document.getElementById("numerator").value = "";
document.getElementById("denominator").value = "";
}
}
// Initial setup and event listener
document.addEventListener("DOMContentLoaded", function() {
document.getElementById("oddsType").addEventListener("change", updateOddsInputs);
updateOddsInputs(); // Call once on load to set initial visibility
});