In trading and investing, two metrics define the mathematical expectancy of your strategy: your Win Rate and your Risk/Reward (R:R) Ratio. It is a common misconception that you need a high win rate to be profitable. In reality, a lower win rate combined with a high risk/reward ratio is often the key to long-term success. This calculator helps you analyze your trading performance to determine your current expectancy and break-even requirements.
Average profit on your winning trades.
Average loss on your losing trades (enter as positive number).
Performance Results
Win Rate
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Risk/Reward Ratio
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Expectancy (Per Trade)
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Break-Even Win Rate Required
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Understanding Your Trading Metrics
This calculator uses your historical trading data to provide critical insights into your strategy's viability.
1. Win Rate (%)
This is simply the percentage of your trades that ended in profit.
Formula: (Winning Trades / Total Trades) * 100
2. Risk/Reward Ratio (R:R)
This represents how much you gain on an average win versus how much you lose on an average loss. A ratio of 1:2 means for every $1 you lose on bad trades, you make $2 on good trades. A ratio higher than 1:1 is generally desirable.
Formula: Average Win Amount / Average Loss Amount
3. Trading Expectancy
This is arguably the most important metric. It calculates the average amount you can expect to win or lose *per trade* over a long series of trades. A positive expectancy means your strategy is theoretically profitable long-term. A negative expectancy means you will eventually lose money, regardless of your win rate.
Formula: (Win Rate % * Average Win) – (Loss Rate % * Average Loss)
4. Break-Even Win Rate
Based on your current Risk/Reward ratio, this is the minimum win rate you must achieve just to not lose money. If your actual win rate is higher than this number, you are profitable.
Formula: 1 / (1 + Risk/Reward Ratio) * 100
function calculateTradingMetrics() {
// 1. Get Input Values
var totalTradesInput = document.getElementById('wr_totalTrades').value;
var winningTradesInput = document.getElementById('wr_winningTrades').value;
var avgWinInput = document.getElementById('wr_avgWin').value;
var avgLossInput = document.getElementById('wr_avgLoss').value;
// 2. Parse and Validate Inputs
var totalTrades = parseFloat(totalTradesInput);
var winningTrades = parseFloat(winningTradesInput);
var avgWin = parseFloat(avgWinInput);
var avgLoss = parseFloat(avgLossInput);
// Basic validation checks
if (isNaN(totalTrades) || totalTrades <= 0) {
alert("Please enter a valid total number of trades greater than zero.");
return;
}
if (isNaN(winningTrades) || winningTrades totalTrades) {
alert("Please enter a valid number of winning trades (must be between 0 and Total Trades).");
return;
}
if (isNaN(avgWin) || avgWin < 0) {
alert("Please enter a valid valid average win amount.");
return;
}
if (isNaN(avgLoss) || avgLoss 0) {
riskRewardRatio = avgWin / avgLoss;
rrDisplayStr = "1:" + riskRewardRatio.toFixed(2);
} else if (avgWin > 0 && avgLoss === 0) {
riskRewardRatio = 9999; // Represent infinity practically
rrDisplayStr = "Infinite (No losses)";
} else {
rrDisplayStr = "N/A";
}
// Expectancy Calculation
// Expectancy = (Probability of Win * Average Win) – (Probability of Loss * Average Loss)
var winProb = winRatePercent / 100;
var lossProb = lossRatePercent / 100;
var expectancy = (winProb * avgWin) – (lossProb * avgLoss);
// Break-Even Win Rate Calculation
// Break Even WE = 1 / (1 + R:R)
var breakEvenWinRate = 0;
if (riskRewardRatio > 0) {
breakEvenWinRate = (1 / (1 + riskRewardRatio)) * 100;
}
// 4. Update Results Display
document.getElementById('wr_resultsArea').style.display = 'block';
document.getElementById('wr_resultWinRate').innerText = winRatePercent.toFixed(1) + "%";
document.getElementById('wr_resultRR').innerText = rrDisplayStr;
document.getElementById('wr_resultExpectancy').innerText = expectancy.toFixed(2);
document.getElementById('wr_resultBreakEven').innerText = breakEvenWinRate.toFixed(1) + "%";
// Interpretation message
var interpretationDiv = document.getElementById('wr_interpretation');
var interpretationMsg = "";
if (expectancy > 0) {
interpretationDiv.className = "mt-3 alert alert-success";
interpretationMsg = "Positive Expectancy: Your strategy is theoretically profitable long-term. On average, you make " + expectancy.toFixed(2) + " per trade over time.";
if (winRatePercent > breakEvenWinRate) {
interpretationMsg += " Your current win rate (" + winRatePercent.toFixed(1) + "%) is above the required break-even rate (" + breakEvenWinRate.toFixed(1) + "%).";
}
} else if (expectancy < 0) {
interpretationDiv.className = "mt-3 alert alert-danger";
interpretationMsg = "Negative Expectancy: Your strategy is currently losing money long-term. On average, you lose " + Math.abs(expectancy).toFixed(2) + " per trade.";
if (riskRewardRatio > 0) {
interpretationMsg += " To become profitable with your current 1:" + riskRewardRatio.toFixed(2) + " R:R ratio, you need a win rate higher than " + breakEvenWinRate.toFixed(1) + "%.";
}
} else {
interpretationDiv.className = "mt-3 alert alert-warning";
interpretationMsg = "Break-Even Expectancy: Your strategy is currently breaking even.";
}
interpretationDiv.innerHTML = interpretationMsg;
}