body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
line-height: 1.6;
color: #333;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.calculator-container {
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
padding: 30px;
margin-bottom: 40px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.calc-header {
text-align: center;
margin-bottom: 25px;
}
.calc-header h2 {
margin: 0;
color: #2c3e50;
}
.input-group {
margin-bottom: 20px;
}
.input-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #444;
}
.input-group input {
width: 100%;
padding: 12px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box; /* Fix for padding increasing width */
}
.input-group input:focus {
border-color: #3498db;
outline: none;
box-shadow: 0 0 5px rgba(52,152,219,0.3);
}
.calc-btn {
display: block;
width: 100%;
padding: 15px;
background: #27ae60;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
}
.calc-btn:hover {
background: #219150;
}
.results-area {
margin-top: 25px;
padding: 20px;
background: #fff;
border: 1px solid #eee;
border-radius: 4px;
display: none; /* Hidden by default */
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
font-weight: 600;
color: #555;
}
.result-value {
font-weight: 700;
color: #2c3e50;
}
.result-value.positive {
color: #27ae60;
}
.result-value.negative {
color: #c0392b;
}
.article-content {
background: #fff;
padding: 20px 0;
}
.article-content h2 {
color: #2c3e50;
margin-top: 30px;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
}
.article-content h3 {
color: #34495e;
margin-top: 20px;
}
.article-content ul, .article-content ol {
margin-left: 20px;
}
.formula-box {
background: #f0f4f8;
padding: 15px;
border-left: 4px solid #3498db;
font-family: monospace;
margin: 20px 0;
}
@media (max-width: 600px) {
.calculator-container {
padding: 15px;
}
}
function formatCurrency(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
function formatPercent(num) {
return num.toFixed(2) + '%';
}
function calculateROI() {
// Get inputs using var as requested
var initialInv = document.getElementById('initialInvestment').value;
var finalVal = document.getElementById('finalValue').value;
var expenses = document.getElementById('expenses').value;
var duration = document.getElementById('duration').value;
// Parse values, default to 0 if empty
var initial = parseFloat(initialInv);
var final = parseFloat(finalVal);
var cost = parseFloat(expenses) || 0;
var years = parseFloat(duration) || 0;
// Validation
if (isNaN(initial) || isNaN(final) || initial 0) {
// Prevent complex numbers if profit is negative in fractional exponents by standard CAGR formulas usually assuming growth
// However, standard math: (End/Start)^(1/t) – 1
// If End/Start is negative, CAGR is undefined in real numbers.
if (final >= 0 && totalCost > 0) {
var ratio = final / totalCost;
annualizedROI = (Math.pow(ratio, 1 / years) – 1) * 100;
showAnnual = true;
}
}
// Display Results
var resultDiv = document.getElementById('results');
resultDiv.style.display = 'block';
var profitElem = document.getElementById('resProfit');
var roiElem = document.getElementById('resROI');
var annualElem = document.getElementById('resAnnual');
var annualRow = document.getElementById('rowAnnual');
profitElem.innerHTML = formatCurrency(netProfit);
roiElem.innerHTML = formatPercent(simpleROI);
// Color coding
if (netProfit >= 0) {
profitElem.className = 'result-value positive';
roiElem.className = 'result-value positive';
} else {
profitElem.className = 'result-value negative';
roiElem.className = 'result-value negative';
}
if (showAnnual) {
annualRow.style.display = 'flex';
annualElem.innerHTML = formatPercent(annualizedROI);
annualElem.className = annualizedROI >= 0 ? 'result-value positive' : 'result-value negative';
} else {
annualRow.style.display = 'none';
}
}
What Is My Rate of Return on Investment (ROI)?
Whether you are investing in stocks, real estate, a small business, or a marketing campaign, understanding the efficiency of that investment is crucial. The Rate of Return on Investment (ROI) is a financial metric used to evaluate the profitability of an investment relative to its cost.
Our calculator helps you determine exactly how much profit you have earned (or lost) as a percentage of your initial capital, taking into account any additional fees or transaction costs.
How to Calculate ROI
The basic formula for ROI is relatively straightforward. It measures the net return of an investment divided by the cost of the investment, expressed as a percentage.
ROI = ((Final Value – Total Cost) / Total Cost) × 100
Where:
- Final Value: The amount you sold the asset for, or its current market value.
- Total Cost: The initial purchase price plus any additional expenses (commissions, maintenance, renovations).
Example Calculation
Let's say you purchased stock for $1,000. You paid a trading fee of $10. Two years later, you sold the stock for $1,500.
- Total Cost: $1,000 + $10 = $1,010
- Net Profit: $1,500 – $1,010 = $490
- ROI: ($490 / $1,010) × 100 = 48.51%
Annualized ROI (CAGR)
While total ROI tells you the total growth, it doesn't account for how long it took to achieve that growth. A 50% return over 1 year is fantastic, but a 50% return over 20 years is quite poor.
To compare investments with different time horizons, we use Annualized ROI, often referred to as the Compound Annual Growth Rate (CAGR).
Annualized ROI = ((Final Value / Total Cost) ^ (1 / Years)) – 1
Using the previous example over a 2-year period:
- Calculation: (($1,500 / $1,010) ^ (1/2)) – 1
- Result: 21.86% per year.
This means your investment grew effectively by 21.86% each year to reach the final amount.
Factors Affecting Your Rate of Return
When using this calculator, ensure you consider all variables that might impact your net return:
- Transaction Fees: Brokerage commissions, closing costs in real estate, or entry/exit loads in mutual funds reducing your base capital.
- Taxes: Capital gains tax can significantly reduce your actual take-home profit.
- Inflation: Nominal ROI (what this calculator shows) is different from Real ROI, which is adjusted for the purchasing power of money over time.
- Dividends/Interest: Don't forget to add any cash flow received during the holding period to your "Final Value" to get a Total Return figure.
Frequently Asked Questions
What is a "good" ROI?
There is no single answer, as it depends on risk tolerance and asset class. Historically, the S&P 500 has returned about 7-10% annually (adjusted for inflation). High-risk investments like startups or cryptocurrency often target much higher ROIs to justify the risk of loss.
Can ROI be negative?
Yes. If your Final Value is less than your Total Cost, you have a negative ROI, indicating a loss on investment.
Why is Annualized ROI important?
It allows for an "apples-to-apples" comparison. It helps you decide if holding a slow-growing asset for 10 years was better than a fast-growing asset you flipped in 6 months.