Stock Gain Calculator
A stock gain calculator is an essential tool for investors to quickly determine the profitability of their stock trades. It helps you understand not just the absolute dollar amount you've gained or lost, but also the percentage return on your investment. This is crucial for evaluating investment performance and making informed decisions.
When you buy and sell stocks, several factors influence your final profit or loss. The most obvious are the purchase price and the sale price per share. However, it's equally important to account for transaction costs, often referred to as commissions. These fees, paid to brokers for executing trades, can eat into your profits or exacerbate your losses, especially on smaller trades.
Using a stock gain calculator, you input the price you paid for each share, the number of shares you bought, the price you sold each share for, and any commissions incurred during both the buying and selling phases. The calculator then processes these figures to provide you with a clear picture of your total monetary gain or loss, as well as the percentage return on your initial investment. This percentage figure is particularly useful for comparing the performance of different investments over time.
Understanding your stock gains and losses is vital for tax purposes, portfolio rebalancing, and refining your investment strategy. By accurately calculating these figures, you can better assess the effectiveness of your trading decisions and plan for future investments.
.stock-gain-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 25px;
background: #f9f9f9;
border-radius: 10px;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
border: 1px solid #e0e0e0;
}
.stock-gain-calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
font-size: 28px;
}
.stock-gain-calculator-container p {
line-height: 1.6;
color: #555;
margin-bottom: 15px;
}
.calculator-form {
background: #ffffff;
padding: 25px;
border-radius: 8px;
border: 1px solid #e9e9e9;
box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}
.form-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
}
.form-group label {
margin-bottom: 8px;
color: #444;
font-weight: bold;
font-size: 15px;
}
.form-group input[type="number"] {
width: 100%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 5px;
box-sizing: border-box;
font-size: 16px;
transition: border-color 0.3s ease;
}
.form-group input[type="number"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}
.calculator-form button {
display: block;
width: 100%;
padding: 14px;
background-color: #28a745;
color: white;
border: none;
border-radius: 5px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 20px;
}
.calculator-form button:hover {
background-color: #218838;
transform: translateY(-2px);
}
.calculator-form button:active {
transform: translateY(0);
}
.result {
margin-top: 25px;
padding: 15px;
background-color: #e9f7ef;
border: 1px solid #d4edda;
border-radius: 8px;
font-size: 18px;
color: #155724;
text-align: center;
font-weight: bold;
line-height: 1.8;
}
.result.error {
background-color: #f8d7da;
border-color: #f5c6cb;
color: #721c24;
}
function calculateStockGain() {
var purchasePricePerShare = parseFloat(document.getElementById('purchasePricePerShare').value);
var numberOfShares = parseFloat(document.getElementById('numberOfShares').value);
var salePricePerShare = parseFloat(document.getElementById('salePricePerShare').value);
var purchaseCommission = parseFloat(document.getElementById('purchaseCommission').value);
var saleCommission = parseFloat(document.getElementById('saleCommission').value);
var resultDiv = document.getElementById('stockGainResult');
if (isNaN(purchasePricePerShare) || isNaN(numberOfShares) || isNaN(salePricePerShare) || isNaN(purchaseCommission) || isNaN(saleCommission) ||
purchasePricePerShare < 0 || numberOfShares <= 0 || salePricePerShare < 0 || purchaseCommission < 0 || saleCommission 0) {
percentageGainLoss = (totalGainLoss / totalPurchaseCost) * 100;
} else {
// This case should ideally not happen with valid stock purchases, but for robustness
percentageGainLoss = Infinity; // Or handle as "N/A"
}
var gainLossText = totalGainLoss >= 0 ? "Gain" : "Loss";
var gainLossColor = totalGainLoss >= 0 ? "#155724" : "#721c24"; // Green for gain, Red for loss
resultDiv.innerHTML = `
Total ${gainLossText}:
$${totalGainLoss.toFixed(2)}
Percentage ${gainLossText}:
${percentageGainLoss.toFixed(2)}%
`;
resultDiv.className = "result";
}