Added Net Present Value Calculator (#797)

Rakesh9100 · May 24, 2024 · a4eb8c8 · a4eb8c8
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diff --git a/Calculators/NPV-Calculator/README.md b/Calculators/NPV-Calculator/README.md
@@ -0,0 +1,27 @@
+# <p align="center">NPV Calculator</p>
+
+## Description :-
+
+Given an initial investment, the discount rate (per year), and the yearly cash flows, this calculator calculates the NPV (Net Present Value) of the investment. NPV is a financial metric used to evaluate the profitability of an investment or project.
+
+## Tech Stacks :-
+
+- HTML
+- CSS
+- JavaScript
+
+## Formula Used :-
+
+The formula for calculating NPV is:
+
+\[ NPV = \sum \left( \frac{CF_t}{(1 + r)^t} \right) - C_0 \]
+
+Where:
+- \( CF_t \) is the cash flow at time \( t \)
+- \( r \) is the discount rate
+- \( C_0 \) is the initial investment
+- \( t \) is the time period (year)
+
+## Screenshots :-
+
+![image](https://github.com/Manav173/CalcDiverse/assets/73993775/640d6aa4-b68b-4057-865c-bee17e8c7e1b)
diff --git a/Calculators/NPV-Calculator/index.html b/Calculators/NPV-Calculator/index.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="style.css">
+    <title>NPV Calculator</title>
+</head>
+
+<body>
+    <div class="calculator-container">
+        <h1>Net Present Value (NPV) Calculator</h1>
+        <div class="input-container">
+            <label for="initialInvestment">Initial Investment (INR)</label>
+            <input id="initialInvestment" type="number" />
+        </div>
+        <div class="input-container">
+            <label for="discountRate">Discount Rate (%)</label>
+            <input id="discountRate" type="number" />
+        </div>
+        <div class="input-container">
+            <label>Cash Flows</label>
+            <div id="cashFlows"></div>
+            <button type="button" onclick="addCashFlow()">+ Add Year</button>
+        </div>
+        <button type="button" onclick="calculateNPV()">Calculate</button>
+        <div class="result-container">
+            <div id="result">NPV: <span id="npvResult" class="red">Rs. 0.00</span></div>
+        </div>
+    </div>
+
+    <script src="script.js"></script>
+</body>
+
+</html>
diff --git a/Calculators/NPV-Calculator/script.js b/Calculators/NPV-Calculator/script.js
@@ -0,0 +1,42 @@
+let cashFlowCount = 0;
+
+function addCashFlow() {
+    cashFlowCount++;
+    const cashFlowsDiv = document.getElementById('cashFlows');
+    const newCashFlow = document.createElement('div');
+    newCashFlow.className = 'cash-flow-item';
+    newCashFlow.innerHTML = `
+        <label for="cashFlow${cashFlowCount}">Year ${cashFlowCount}: <br> ₹</label>
+        <input id="cashFlow${cashFlowCount}" type="number"/>
+        <button type="button" onclick="removeCashFlow(this); cashFlowCount--;">x</button>
+    `;
+    cashFlowsDiv.appendChild(newCashFlow);
+}
+
+function removeCashFlow(button) {
+    const cashFlowItem = button.parentElement;
+    cashFlowItem.remove();
+}
+
+function calculateNPV() {
+    const initialInvestment = parseFloat(document.getElementById('initialInvestment').value);
+    const discountRate = parseFloat(document.getElementById('discountRate').value) / 100;
+    const cashFlowItems = document.querySelectorAll('.cash-flow-item input');
+
+    if (isNaN(initialInvestment) || isNaN(discountRate)) {
+        alert('Please enter valid inputs.');
+        return;
+    }
+
+    let npv = -initialInvestment;
+    cashFlowItems.forEach((input, index) => {
+        const cashFlow = parseFloat(input.value);
+        if (isNaN(cashFlow)) {
+            alert('Please enter valid cash flow values.');
+            return;
+        }
+        npv += cashFlow / Math.pow(1 + discountRate, index + 1);
+    });
+
+    document.getElementById('npvResult').textContent = npv.toFixed(2);
+}
diff --git a/Calculators/NPV-Calculator/style.css b/Calculators/NPV-Calculator/style.css
@@ -0,0 +1,71 @@
+body {
+    font-family: 'Arial', sans-serif;
+    background: linear-gradient(to right, #f48a8a, #a3dbf5);
+    margin: 0;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 100vh;
+}
+
+.calculator-container {
+    background-color: #fff;
+    border-radius: 10px;
+    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+    padding: 20px;
+    width: 500px;
+    text-align: center;
+}
+
+h1 {
+    color: #333;
+}
+
+.input-container {
+    margin-bottom: 15px;
+}
+
+label {
+    display: block;
+    margin-bottom: 5px;
+    color: #555;
+}
+
+input {
+    width: 100%;
+    padding: 8px;
+    border: 1px solid #ddd;
+    border-radius: 5px;
+    box-sizing: border-box;
+}
+
+button {
+    background-color: #4caf50;
+    color: #fff;
+    padding: 10px 20px;
+    border: none;
+    border-radius: 5px;
+    cursor: pointer;
+    font-size: 16px;
+}
+
+button:hover {
+    background-color: #45a049;
+    transform: scale(1.05);
+    transition: 0.2s ease-in-out;
+}
+
+.result-container {
+    margin-top: 20px;
+}
+
+#result {
+    font-size: 18px;
+    font-family: 'Courier New', Courier, monospace;
+    font-weight: bold;
+    color: #333;
+}
+
+.red {
+    color: #f44336;
+}
diff --git a/index.html b/index.html
@@ -1252,6 +1252,20 @@ <h3>Calculates the multiplication table of any number.</h3>
                 </a>
             </div>
         </div>
+        <div class="box">
+            <div class="content">
+                <h2>NPV Calculator</h2>
+                <h3>Calculates the Net Present Value based on initial investment, the discount rate, and the yearly cash flows.</h3>
+                <div class="card-footer">
+                    <a href="./Calculators/NPV-Calculator/index.html" target="_blank">
+                        <button>Try Now</button>
+                    </a>
+                    <a href="https://github.com/Rakesh9100/CalcDiverse/tree/main/Calculators/NPV-Calculator/" title="Source Code" target="_blank">
+                        <img src="./assets/images/github.png" alt="Source Code"></img>
+                    </a>
+                </div>
+            </div>
+        </div>
         <div class="box">
             <div class="content">
                 <h2>Neon Number Calculator</h2>