NPV Calculator (Net Present Value)
The Net Present Value (NPV) is a core concept in financial analysis used to determine the profitability of an investment. It represents the difference between the present value of cash inflows and the present value of cash outflows over a period of time. A positive NPV indicates that the projected earnings generated by an investment will be more than the anticipated costs, suggesting that the investment is worthwhile. Conversely, a negative NPV suggests the opposite.
While the discount rate is fundamental to NPV calculation, it's technically possible to understand the *direction* of NPV without a precise rate if you make certain assumptions. For instance, if all future cash flows are positive and occur in the future, and the initial investment is negative, the NPV will always be positive if the discount rate is zero (which is unrealistic but illustrative). However, for a meaningful and accurate NPV calculation, a discount rate is essential.
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-inputs {
margin-top: 15px;
display: grid;
gap: 15px;
}
.input-group {
display: flex;
flex-direction: column;
}
.input-group label {
margin-bottom: 5px;
font-weight: bold;
color: #333;
}
.input-group input {
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box;
}
button {
padding: 12px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #0056b3;
}
.calculator-result {
margin-top: 20px;
padding: 15px;
background-color: #e9ecef;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 1.1em;
text-align: center;
font-weight: bold;
color: #495057;
}
function calculateNPV() {
var initialInvestment = parseFloat(document.getElementById("initialInvestment").value);
var cashFlowsInput = document.getElementById("cashFlows").value;
var discountRate = parseFloat(document.getElementById("discountRate").value);
var resultDiv = document.getElementById("result");
if (isNaN(initialInvestment) || isNaN(discountRate) || cashFlowsInput.trim() === "") {
resultDiv.textContent = "Please enter valid numbers for all fields.";
return;
}
var cashFlowsArray = cashFlowsInput.split(',')
.map(function(flow) {
return parseFloat(flow.trim());
})
.filter(function(flow) {
return !isNaN(flow);
});
if (cashFlowsArray.length === 0) {
resultDiv.textContent = "Please enter at least one valid future cash flow.";
return;
}
var rate = discountRate / 100;
var presentValueCashInflows = 0;
for (var i = 0; i = 0 ? "$" : "-$") + Math.abs(npv).toFixed(2);
if (npv > 0) {
message += " – This investment is potentially profitable.";
} else if (npv < 0) {
message += " – This investment is potentially unprofitable.";
} else {
message += " – This investment is expected to break even.";
}
resultDiv.textContent = message;
}