function calculateWinRateRiskReward() {
// 1. Get input values
var winRateInput = document.getElementById("wrWinRate").value;
var avgWinInput = document.getElementById("wrAvgWin").value;
var avgLossInput = document.getElementById("wrAvgLoss").value;
var numTradesInput = document.getElementById("wrNumTrades").value;
// 2. Parse values
var winRatePercent = parseFloat(winRateInput);
var avgWin = parseFloat(avgWinInput);
var avgLoss = parseFloat(avgLossInput);
var numTrades = parseInt(numTradesInput) || 100; // Default to 100 if empty
// 3. Validation & Edge Case Handling
if (isNaN(winRatePercent) || winRatePercent 100) {
alert("Please enter a valid Win Rate percentage between 0 and 100.");
return;
}
if (isNaN(avgWin) || avgWin < 0) {
alert("Please enter a valid Average Profit.");
return;
}
if (isNaN(avgLoss) || avgLoss < 0) {
alert("Please enter a valid Average Loss.");
return;
}
// Handle division by zero scenarios for risk/reward and break-even
var totalRiskRewardCombined = avgWin + avgLoss;
if (totalRiskRewardCombined 0 ? (avgWin / avgLoss).toFixed(2) : "∞");
// Calculate Break-Even Win Rate Formula: Risk / (Risk + Reward)
var breakEvenWinRate = (avgLoss / totalRiskRewardCombined) * 100;
// Calculate Expected Value (EV) per trade Formula: (Win % * Avg Win) – (Loss % * Avg Loss)
var expectedValue = (winProbability * avgWin) – (lossProbability * avgLoss);
// Calculate Total Projected Profit over N trades
var totalProjectedProfit = expectedValue * numTrades;
// 5. Display Results
document.getElementById("wrResults").style.display = "block";
document.getElementById("wrResultRatio").innerText = riskRewardRatioText;
document.getElementById("wrBreakEven").innerText = breakEvenWinRate.toFixed(2) + "%";
// Format EV with color and currency
var evElement = document.getElementById("wrEVPerTrade");
evElement.innerText = "$" + expectedValue.toFixed(2);
evElement.className = "wr-result-value " + (expectedValue >= 0 ? "wr-positive" : "wr-negative");
// Format Total Projected Profit with color and currency
document.getElementById("wrTotalLabel").innerText = "Total Projected Profit/Loss (" + numTrades + " Trades):";
var totalElement = document.getElementById("wrTotalProfitLoss");
totalElement.innerText = "$" + totalProjectedProfit.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ","); // Add commas
totalElement.className = "wr-result-value " + (totalProjectedProfit >= 0 ? "wr-positive" : "wr-negative");
}
Mastering Your Trading Strategy: Understanding Win Rate, Risk, and Reward
In the world of trading—whether stocks, forex, or cryptocurrency—many beginners obsess solely over finding a system with a high "win rate." They believe that if they are correct 80% or 90% of the time, profitability is guaranteed. However, experienced traders know that win rate is only one part of the equation. True long-term success depends on the delicate balance between how often you win and how much you win versus how much you lose.
This calculator helps you analyze the mathematical viability of a trading strategy by examining three critical metrics: Win Rate, Risk (Average Loss), and Reward (Average Profit). By understanding how these interact, you can determine the "Expected Value" of your system, telling you if it is likely to be profitable over time.
Key Concepts Defined
Win Rate (%): The percentage of your trades that end in profit. For example, if you make 100 trades and 55 are profitable, your win rate is 55%.
Risk (Average Loss): The average amount of money you lose on a losing trade. This is often controlled by stop-loss orders.
Reward (Average Win): The average amount of money you gain on a winning trade.
Risk/Reward Ratio: This indicates how much you are aiming to gain for every dollar you risk. If your average loss is $100 and your average win is $200, your risk/reward ratio is 1:2. A higher ratio means you don't need as high a win rate to be profitable.
Expected Value (EV): This is the most critical metric. It calculates the average amount you can expect to win or lose per trade over the long run. A positive EV means your strategy is mathematically sound; a negative EV means you will eventually lose money, regardless of your win rate.
How to interpret the Results
Once you input your strategy's metrics into the calculator above, pay close attention to these two outputs:
1. Required Win Rate to Break Even: This tells you the minimum win rate you must achieve, given your current risk/reward parameters, just to avoid losing money. If your actual win rate is lower than this number, your strategy is currently losing money.
2. Expected Value (EV) per Trade:
If this number is positive (green), your strategy has a statistical "edge." Over hundreds of trades, you should generally come out ahead.
If this number is negative (red), your strategy has a negative expectancy. Even if you have winning streaks, the mathematics suggests you will lose capital in the long run. You either need to improve your win rate, increase your average winners, or decrease your average losers.
Remember, a strategy with a low 40% win rate can still be highly profitable if the winning trades are significantly larger than the losing trades (e.g., a 1:3 risk/reward ratio).