Return on Investment (ROI) Calculator
The Return on Investment (ROI) is a performance measure used to evaluate the efficiency of an investment or compare the efficiency of a number of different investments. ROI tries to directly measure the amount of return on a particular investment, in relation to the investment's cost. To calculate ROI, the benefit (or return) of an investment is divided by the cost of the investment. The result is expressed in percentage, although it may also be expressed as a ratio.
Calculate ROI
#roi-calculator {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 5px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-inputs {
margin-bottom: 15px;
}
.input-group {
margin-bottom: 10px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.input-group input {
width: calc(100% – 10px);
padding: 8px;
border: 1px solid #ccc;
border-radius: 3px;
}
#roi-calculator button {
background-color: #4CAF50;
color: white;
padding: 10px 15px;
border: none;
border-radius: 3px;
cursor: pointer;
font-size: 1em;
margin-top: 10px;
}
#roi-calculator button:hover {
background-color: #45a049;
}
.calculator-result {
margin-top: 20px;
padding: 10px;
border: 1px solid #eee;
background-color: #fff;
border-radius: 3px;
font-weight: bold;
text-align: center;
}
function calculateROI() {
var initialInvestment = parseFloat(document.getElementById("initialInvestment").value);
var finalValue = parseFloat(document.getElementById("finalValue").value);
var resultElement = document.getElementById("roiResult");
if (isNaN(initialInvestment) || isNaN(finalValue)) {
resultElement.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (initialInvestment < 0 || finalValue < 0) {
resultElement.innerHTML = "Investment costs and final values cannot be negative.";
return;
}
if (initialInvestment === 0) {
resultElement.innerHTML = "Initial investment cannot be zero.";
return;
}
var profit = finalValue – initialInvestment;
var roi = (profit / initialInvestment) * 100;
resultElement.innerHTML = "Net Profit: $" + profit.toFixed(2) + "ROI: " + roi.toFixed(2) + "%";
}