How to Create an Education Loan Calculator Using HTML, CSS, and JavaScript

1. Introduction to the Education Loan Calculator

An Education Loan Calculator is a web-based tool that helps users determine:
The monthly EMI (Equated Monthly Installment).
Total interest payable on the loan.
Total repayment amount (principal + interest).
This tool can be helpful for students and parents to plan their finances effectively.
1. Step to Build the Calculator

Here’s how you can create the tool:
HTML Structure:
Design the basic layout, including input fields for loan details, a calculate button, and a results section.
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Education Loan Calculator</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="styles.css">
    <style>
      :root {
    --primary-blue: #007BFF;
    --primary-blue-hover: #0056D2;
    --success-green: #28A745;
    --success-green-hover: #218838;
    --light-grey: #F8F9FA;
    --text-grey: #6C757D;
    --accent-yellow: #FFC107;
    --accent-orange: #FD7E14;
}

body {
    background-color: var(--light-grey);
    color: #333;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.calculator-wrapper {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    margin: 2rem 0;
}

h1 {
    color: var(--primary-blue);
    font-weight: 600;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    color: var(--text-grey);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-control {
    border: 2px solid #0080ff;
    border-radius: 8px;
    padding: 0.75rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-range {
    height: 6px;
    margin: 1rem 0;
}

.form-range::-webkit-slider-thumb {
    background: var(--primary-blue);
}

.form-range::-webkit-slider-thumb:hover {
    background: var(--primary-blue-hover);
}

.result-card {
    background: var(--light-grey);
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.result-card:hover {
    transform: translateY(-5px);
}

.result-card.emi {
    border-left: 5px solid var(--primary-blue);
}

.result-card.interest {
    border-left: 5px solid var(--accent-orange);
}

.result-card.total {
    border-left: 5px solid var(--success-green);
}

.result-card h4 {
    color: var(--text-grey);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.result-card p {
    color: #333;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-blue);
    border: none;
}

.btn-primary:hover {
    background-color: var(--primary-blue-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--text-grey);
    border: none;
    margin-left: 1rem;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.table {
    border-radius: 10px;
    overflow: hidden;
}

.table thead th {
    background-color: var(--primary-blue);
    color: white;
    font-weight: 500;
    border: none;
}

.table tbody tr:hover {
    background-color: rgba(0, 123, 255, 0.05);
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator-wrapper {
        padding: 1rem;
    }
    
    .btn {
        width: 100%;
        margin: 0.5rem 0;
    }
    
    .btn-secondary {
        margin-left: 0;
    }
}
    </style>
</head>
<body>
    <div class="container">
        <div class="calculator-wrapper">
            <h1 class="text-center mb-4">Education Loan Calculator</h1>
            
            <div class="row">
                <!-- Input Section -->
                <div class="col-md-6">
                    <div class="input-section">
                        <h3>Loan Details</h3>
                        <div class="form-group">
                            <label for="loanAmount">Loan Amount</label>
                            <input type="range" class="form-range" id="loanAmountSlider" min="10000" max="5000000" step="10000">
                            <input type="number" class="form-control" id="loanAmount" placeholder="Enter loan amount">
                        </div>

                        <div class="form-group">
                            <label for="interestRate">Interest Rate (%)</label>
                            <input type="range" class="form-range" id="interestRateSlider" min="1" max="20" step="0.1">
                            <input type="number" class="form-control" id="interestRate" placeholder="Enter interest rate">
                        </div>

                        <div class="form-group">
                            <label for="loanTenure">Loan Tenure (Years)</label>
                            <input type="range" class="form-range" id="loanTenureSlider" min="1" max="20" step="1">
                            <input type="number" class="form-control" id="loanTenure" placeholder="Enter loan tenure">
                        </div>

                        <div class="form-group">
                            <label for="processingFee">Processing Fee (%)</label>
                            <input type="number" class="form-control" id="processingFee" placeholder="Optional">
                        </div>

                        <div class="form-group">
                            <label for="gracePeriod">Grace Period (Months)</label>
                            <input type="number" class="form-control" id="gracePeriod" placeholder="Optional">
                        </div>
                    </div>
                </div>

                <!-- Results Section -->
                <div class="col-md-6">
                    <div class="results-section">
                        <h3>Loan Summary</h3>
                        <div class="result-card emi">
                            <h4>Monthly EMI</h4>
                            <p id="emiAmount">₹0</p>
                        </div>
                        <div class="result-card interest">
                            <h4>Total Interest</h4>
                            <p id="totalInterest">₹0</p>
                        </div>
                        <div class="result-card total">
                            <h4>Total Payment</h4>
                            <p id="totalPayment">₹0</p>
                        </div>
                        <button id="calculateBtn" class="btn btn-primary">Calculate</button>
                        <button id="exportBtn" class="btn btn-secondary">Export Schedule</button>
                    </div>
                </div>
            </div>

            <!-- Amortization Schedule -->
            <div class="amortization-section mt-4">
                <h3>Amortization Schedule</h3>
                <div class="table-responsive">
                    <table class="table table-striped">
                        <thead>
                            <tr>
                                <th>Month</th>
                                <th>EMI</th>
                                <th>Principal</th>
                                <th>Interest</th>
                                <th>Balance</th>
                            </tr>
                        </thead>
                        <tbody id="amortizationBody">
                            <!-- Will be filled by JavaScript -->
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
    <script src="script.js"></script>
    <script>
      document.addEventListener('DOMContentLoaded', function() {
    // Get all input elements
    const loanAmountSlider = document.getElementById('loanAmountSlider');
    const loanAmount = document.getElementById('loanAmount');
    const interestRateSlider = document.getElementById('interestRateSlider');
    const interestRate = document.getElementById('interestRate');
    const loanTenureSlider = document.getElementById('loanTenureSlider');
    const loanTenure = document.getElementById('loanTenure');
    const processingFee = document.getElementById('processingFee');
    const gracePeriod = document.getElementById('gracePeriod');
    const calculateBtn = document.getElementById('calculateBtn');
    const exportBtn = document.getElementById('exportBtn');

    // Initialize default values
    loanAmount.value = 1000000;
    loanAmountSlider.value = 1000000;
    interestRate.value = 8;
    interestRateSlider.value = 8;
    loanTenure.value = 4;
    loanTenureSlider.value = 4;

    // Sync sliders with input fields
    function syncInputs(slider, input) {
        slider.addEventListener('input', () => {
            input.value = slider.value;
            calculateLoan();
        });
        input.addEventListener('input', () => {
            slider.value = input.value;
            calculateLoan();
        });
    }

    syncInputs(loanAmountSlider, loanAmount);
    syncInputs(interestRateSlider, interestRate);
    syncInputs(loanTenureSlider, loanTenure);

    // Add input event listeners for optional fields
    [processingFee, gracePeriod].forEach(input => {
        input.addEventListener('input', calculateLoan);
    });

    // Calculate EMI
    function calculateEMI(principal, rate, time) {
        rate = rate / 1200; // Convert annual rate to monthly and percentage to decimal
        time = time * 12;   // Convert years to months
        return principal * rate * Math.pow(1 + rate, time) / (Math.pow(1 + rate, time) - 1);
    }

    // Format currency
    function formatCurrency(amount) {
        return new Intl.NumberFormat('en-IN', {
            style: 'currency',
            currency: 'INR',
            maximumFractionDigits: 0
        }).format(amount);
    }

    // Calculate and display loan details
    function calculateLoan() {
        const p = parseFloat(loanAmount.value);
        const r = parseFloat(interestRate.value);
        const t = parseFloat(loanTenure.value);
        
        if (isNaN(p) || isNaN(r) || isNaN(t)) return;

        const emi = calculateEMI(p, r, t);
        const totalPayment = emi * t * 12;
        const totalInterest = totalPayment - p;

        // Display results
        document.getElementById('emiAmount').textContent = formatCurrency(emi);
        document.getElementById('totalInterest').textContent = formatCurrency(totalInterest);
        document.getElementById('totalPayment').textContent = formatCurrency(totalPayment);

        // Generate amortization schedule
        generateAmortizationSchedule(p, r, t, emi);
    }

    // Generate amortization schedule
    function generateAmortizationSchedule(principal, rate, time, emi) {
        const tableBody = document.getElementById('amortizationBody');
        tableBody.innerHTML = '';
        
        let balance = principal;
        const monthlyRate = rate / 1200;
        
        for (let month = 1; month <= time * 12; month++) {
            const interest = balance * monthlyRate;
            const principalPaid = emi - interest;
            balance -= principalPaid;

            const row = document.createElement('tr');
            row.innerHTML = `
                <td>${month}</td>
                <td>${formatCurrency(emi)}</td>
                <td>${formatCurrency(principalPaid)}</td>
                <td>${formatCurrency(interest)}</td>
                <td>${formatCurrency(Math.max(0, balance))}</td>
            `;
            tableBody.appendChild(row);
        }
    }

    // Export amortization schedule
    function exportSchedule() {
        const tableData = [];
        const rows = document.querySelectorAll('#amortizationBody tr');
        
        rows.forEach(row => {
            const rowData = Array.from(row.cells).map(cell => cell.textContent);
            tableData.push(rowData.join(','));
        });

        const csvContent = 'Month,EMI,Principal,Interest,Balance\n' + tableData.join('\n');
        const blob = new Blob([csvContent], { type: 'text/csv' });
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'loan-schedule.csv';
        a.click();
        window.URL.revokeObjectURL(url);
    }

    // Add event listeners for buttons
    calculateBtn.addEventListener('click', calculateLoan);
    exportBtn.addEventListener('click', exportSchedule);

    // Calculate loan on initial load
    calculateLoan();
});
    </script>
</body>
</html>