function calculateWinRate() {
// 1. Get Input Values
var wins = parseFloat(document.getElementById('tswrc_wins').value);
var losses = parseFloat(document.getElementById('tswrc_losses').value);
var avgWin = parseFloat(document.getElementById('tswrc_avg_win').value);
var avgLoss = parseFloat(document.getElementById('tswrc_avg_loss').value);
// 2. Validate Inputs
if (isNaN(wins) || wins < 0) wins = 0;
if (isNaN(losses) || losses < 0) losses = 0;
// Check if there are trades
var totalTrades = wins + losses;
if (totalTrades === 0) {
alert("Please enter at least one winning or losing trade.");
return;
}
if (isNaN(avgWin) || avgWin < 0) avgWin = 0;
if (isNaN(avgLoss) || avgLoss 0) {
rrRatio = avgWin / avgLoss;
} else if (avgWin > 0) {
rrRatio = avgWin; // Infinite reward effectively
}
// Expectancy Calculation: (Win % * Avg Win) – (Loss % * Avg Loss)
var winPercentDecimal = winRate / 100;
var lossPercentDecimal = 1 – winPercentDecimal;
var expectancy = (winPercentDecimal * avgWin) – (lossPercentDecimal * avgLoss);
// Break-even Win Rate Calculation: 1 / (1 + Risk/Reward)
var breakEvenRate = 0;
if (rrRatio > 0) {
breakEvenRate = (1 / (1 + rrRatio)) * 100;
}
// 4. Update UI
var resultBox = document.getElementById('tswrc_result');
resultBox.style.display = 'block';
document.getElementById('tswrc_disp_win_rate').innerText = winRate.toFixed(2) + "%";
document.getElementById('tswrc_disp_rr').innerText = "1:" + rrRatio.toFixed(2);
document.getElementById('tswrc_disp_expectancy').innerText = expectancy.toFixed(2);
document.getElementById('tswrc_disp_breakeven').innerText = breakEvenRate.toFixed(2) + "%";
// 5. Verdict Logic
var verdictBox = document.getElementById('tswrc_verdict_box');
if (expectancy > 0) {
verdictBox.className = "tswrc-verdict profitable";
verdictBox.innerHTML = "PROFITABLE STRATEGYYour strategy yields a positive expectancy of " + expectancy.toFixed(2) + " units per trade.";
} else if (expectancy < 0) {
verdictBox.className = "tswrc-verdict unprofitable";
verdictBox.innerHTML = "UNPROFITABLE STRATEGYYou are losing " + Math.abs(expectancy).toFixed(2) + " units per trade on average.";
} else {
verdictBox.className = "tswrc-verdict";
verdictBox.style.background = "#f3f4f6";
verdictBox.style.color = "#374151";
verdictBox.style.border = "1px solid #d1d5db";
verdictBox.innerHTML = "BREAK EVENYour expectancy is zero.";
}
}
Why Is Trading Win Rate Important?
In the world of financial markets—whether you are trading stocks, forex, or cryptocurrency—your Win Rate is one of the fundamental metrics for performance analysis. It represents the percentage of trades that resulted in a profit out of the total trades executed.
However, a common misconception among novice traders is that a high win rate is the only path to profitability. This calculator demonstrates that your "Strike Rate" is only half the picture; the relationship between your average win size and average loss size (Risk/Reward Ratio) is equally critical.
How the Trading Strategy Win Rate Calculator Works
This tool evaluates the mathematical viability of your trading system using four key inputs:
Total Winning Trades: The absolute number of trades that closed in profit.
Total Losing Trades: The absolute number of trades that closed in a loss.
Average Profit per Win: The arithmetic mean of all your winning trades (in dollars, pips, or points).
Average Loss per Loss: The arithmetic mean of all your losing trades.
Risk/Reward Ratio (R:R):
This measures how much you earn for every dollar you risk. If your average win is $200 and your average loss is $100, your R:R is 1:2. This means you only need a win rate greater than 33.3% to be profitable.
Expectancy (Expected Value):
This is the most important number in trading. It calculates the average amount you can expect to win (or lose) per trade over the long run.
Formula: (Win % × Average Win) – (Loss % × Average Loss)
The "Holy Grail" of Trading Math
Many traders chase a 90% win rate, but often strategies with such high win rates have a poor Risk/Reward ratio (e.g., risking $100 to make $10). In such a scenario, one large loss can wipe out ten wins.
Conversely, trend-following strategies often have a win rate of only 40%. Yet, because they cut losses quickly and let winners run (creating a 1:3 or 1:4 Risk/Reward ratio), they remain highly profitable. Use this calculator to balance your win rate against your risk profile to find a sustainable edge.