.roi-calc-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 12px;
background-color: #ffffff;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.roi-calc-header {
text-align: center;
margin-bottom: 30px;
}
.roi-calc-header h2 {
color: #2c3e50;
margin-bottom: 10px;
}
.roi-calc-form {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
.roi-calc-field {
display: flex;
flex-direction: column;
}
.roi-calc-field label {
font-weight: 600;
margin-bottom: 8px;
color: #34495e;
}
.roi-calc-field input {
padding: 12px;
border: 1px solid #ced4da;
border-radius: 6px;
font-size: 16px;
}
.roi-calc-btn-wrapper {
grid-column: span 2;
text-align: center;
margin-top: 10px;
}
.roi-calc-btn {
background-color: #27ae60;
color: white;
padding: 15px 40px;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: 700;
cursor: pointer;
transition: background-color 0.3s;
}
.roi-calc-btn:hover {
background-color: #219150;
}
.roi-calc-results {
grid-column: span 2;
margin-top: 30px;
padding: 20px;
background-color: #f8f9fa;
border-radius: 8px;
display: none;
}
.roi-result-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 15px;
}
.roi-result-item {
text-align: center;
}
.roi-result-label {
font-size: 14px;
color: #7f8c8d;
text-transform: uppercase;
}
.roi-result-value {
font-size: 24px;
font-weight: 800;
color: #2c3e50;
}
.roi-positive { color: #27ae60 !important; }
.roi-negative { color: #e74c3c !important; }
.roi-article-content {
margin-top: 40px;
line-height: 1.6;
color: #333;
}
.roi-article-content h2 { color: #2c3e50; margin-top: 30px; }
.roi-article-content p { margin-bottom: 15px; }
.roi-article-content ul { margin-bottom: 15px; padding-left: 20px; }
@media (max-width: 600px) {
.roi-calc-form { grid-template-columns: 1fr; }
.roi-calc-btn-wrapper { grid-column: span 1; }
.roi-calc-results { grid-column: span 1; }
}
What is Return on Investment (ROI)?
Return on Investment (ROI) is a critical financial metric used to evaluate the efficiency of an investment or compare the efficiencies of several different investments. It measures the amount of return on an investment relative to the investment's cost.
The ROI Calculation Formula
The standard ROI formula is straightforward:
ROI = [(Final Value – Initial Cost) / Initial Cost] x 100
Where:
- Final Value: The total amount received from the investment (revenue or proceeds).
- Initial Cost: The total capital spent to acquire or maintain the investment.
How to Use the ROI Calculator
To use this tool, simply input the total amount of money you spent (Initial Cost) and the total amount you received back (Final Value). The calculator will instantly provide your Net Profit and the ROI expressed as a percentage.
Real-World ROI Examples
- Marketing Campaign: If you spend $1,000 on ads and generate $3,000 in sales, your ROI is 200%. Your net profit is $2,000.
- Real Estate: You purchase a property for $200,000 and sell it for $250,000. Your ROI is 25%, with a $50,000 gain (ignoring transaction costs for simplicity).
- Stock Market: Investing $10,000 in stocks that grow to $11,500 results in a 15% ROI.
Why is ROI Important?
ROI allows business owners and investors to strip away the complexity of a project and see its core profitability. It helps in decision-making by identifying which ventures provide the highest yield for every dollar spent. However, it is important to remember that ROI does not account for the time factor (how long it took to earn the return) or risk.
function calculateROI() {
var initialCost = document.getElementById("initialCost").value;
var finalValue = document.getElementById("finalValue").value;
var resultDiv = document.getElementById("roiResults");
var profitEl = document.getElementById("netProfit");
var percentEl = document.getElementById("roiPercentage");
if (initialCost === "" || finalValue === "" || parseFloat(initialCost) === 0) {
alert("Please enter valid numbers. Initial investment cannot be zero.");
return;
}
var cost = parseFloat(initialCost);
var gain = parseFloat(finalValue);
var netProfit = gain – cost;
var roi = (netProfit / cost) * 100;
// Formatting currency
var formattedProfit = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
}).format(netProfit);
// Update UI
profitEl.innerHTML = formattedProfit;
percentEl.innerHTML = roi.toFixed(2) + "%";
// Add color classes
if (roi >= 0) {
percentEl.className = "roi-result-value roi-positive";
profitEl.className = "roi-result-value roi-positive";
} else {
percentEl.className = "roi-result-value roi-negative";
profitEl.className = "roi-result-value roi-negative";
}
resultDiv.style.display = "block";
}