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<!DOCTYPE html>

<head>

<title>EMI Calculator</title>

<style>

body {

font-family: ‘Inter’, sans-serif;

}

/* Custom styles for sliders */

input[type=”range”] {

-webkit-appearance: none;

appearance: none;

width: 100%;

height: 6px;

background: #e5e7eb; /* gray-200 */

border-radius: 9999px;

outline: none;

opacity: 0.9;

transition: opacity .2s;

}

input[type=”range”]::-webkit-slider-thumb {

-webkit-appearance: none;

appearance: none;

width: 20px;

height: 20px;

background: #16a34a; /* green-600 */

cursor: pointer;

border-radius: 50%;

border: 2px solid white;

}

input[type=”range”]::-moz-range-thumb {

width: 20px;

height: 20px;

background: #16a34a; /* green-600 */

cursor: pointer;

border-radius: 50%;

border: 2px solid white;

}

.monthly-details td {

padding: 0;

background-color: #f9fafb; /* gray-50 */

}

.monthly-details .inner-table {

margin: 1rem;

width: calc(100% – 2rem);

}

</style>

</head>

<h1 class=”text-3xl md:text-4xl font-bold text-center text-gray-900 mb-2″>EMI Calculator</h1>

<p class=”text-center text-gray-500 mb-8 md:mb-12″>Calculate your loan EMI (Equated Monthly Instalment) easily.</p>

<!– Left Side: Inputs –>

<!– Loan Amount –>

<div>

<label for=”amount” class=”font-medium text-gray-700″>Loan Amount</label>

</div>

</div>

<!– Interest Rate –>

<div>

<label for=”interest” class=”font-medium text-gray-700″>Interest Rate</label>

</div>

</div>

<!– Loan Tenure –>

<div>

<label for=”tenure” class=”font-medium text-gray-700″>Loan Tenure</label>

</div>

</div>

<!– Right Side: Outputs & Chart –>

</div>

<p class=”text-gray-500 text-lg”>Monthly EMI</p>

</div>

<p class=”text-gray-500″>Principal Amount</p>

</div>

<p class=”text-gray-500″>Total Interest</p>

</div>

<p class=”text-gray-500″>Total Payment</p>

</div>

<!– Amortization Schedule –>

<h2 class=”text-2xl font-bold text-gray-900 mb-4″>Amortization Details</h2>

<tr>

<th scope=”col” class=”px-6 py-3 text-right text-xs font-medium text-gray-500 uppercase tracking-wider”>Principal</th>

<th scope=”col” class=”px-6 py-3 text-right text-xs font-medium text-gray-500 uppercase tracking-wider”>Interest</th>

<th scope=”col” class=”px-6 py-3 text-right text-xs font-medium text-gray-500 uppercase tracking-wider”>Total Payment</th>

<th scope=”col” class=”px-6 py-3 text-right text-xs font-medium text-gray-500 uppercase tracking-wider”>Balance</th>

</tr>

</thead>

<!– Rows will be injected by JavaScript –>

</tbody>

</table>

</div>

document.addEventListener(‘DOMContentLoaded’, function () {

// DOM Elements

const amountSlider = document.getElementById(‘amountSlider’);

const amountInput = document.getElementById(‘amountInput’);

const interestSlider = document.getElementById(‘interestSlider’);

const interestInput = document.getElementById(‘interestInput’);

const tenureSlider = document.getElementById(‘tenureSlider’);

const tenureInput = document.getElementById(‘tenureInput’);

const monthlyEmiEl = document.getElementById(‘monthlyEmi’);

const totalPrincipalEl = document.getElementById(‘totalPrincipal’);

const totalInterestEl = document.getElementById(‘totalInterest’);

const totalPaymentEl = document.getElementById(‘totalPayment’);

const scheduleBody = document.getElementById(‘scheduleBody’);

let emiChart;

// Format numbers with commas

const formatCurrency = (num) => `₹${Math.round(num).toLocaleString(‘en-IN’)}`;

const formatInputCurrency = (num) => Math.round(num).toLocaleString(‘en-IN’, { useGrouping: false });

// Chart Initialization

const ctx = document.getElementById(’emiChart’).getContext(‘2d’);

function createOrUpdateChart(principal, interest) {

const data = {

labels: [‘Principal Amount’, ‘Total Interest’],

datasets: [{

data: [principal, interest],

backgroundColor: [‘#16a34a’, ‘#dcfce7’], // green-600, green-100

borderColor: [‘#ffffff’, ‘#ffffff’],

borderWidth: 2,

hoverOffset: 4

}]

};

if (emiChart) {

emiChart.data = data;

emiChart.update();

} else {

emiChart = new Chart(ctx, {

type: ‘doughnut’,

data: data,

options: {

responsive: true,

cutout: ‘70%’,

plugins: {

legend: {

position: ‘bottom’,

labels: {

usePointStyle: true,

pointStyle: ‘circle’,

padding: 20,

boxWidth: 8,

boxHeight: 8

}

tooltip: {

callbacks: {

label: function (context) {

let label = context.label || ”;

if (label) {

label += ‘: ‘;

}

if (context.parsed !== null) {

label += formatCurrency(context.parsed);

}

return label;

}

});

}

// Main Calculation Function

function calculate() {

const p = parseFloat(amountSlider.value);

const rAnnual = parseFloat(interestSlider.value);

const tYears = parseInt(tenureSlider.value, 10);

if (isNaN(p) || isNaN(rAnnual) || isNaN(tYears) || p <= 0 || rAnnual <= 0 || tYears <= 0) {

return;

}

const rMonthly = rAnnual / 12 / 100;

const nMonths = tYears * 12;

const emi = (p * rMonthly * Math.pow(1 + rMonthly, nMonths)) / (Math.pow(1 + rMonthly, nMonths) – 1);

const totalPayment = emi * nMonths;

const totalInterest = totalPayment – p;

// Update summary display

monthlyEmiEl.textContent = formatCurrency(emi);

totalPrincipalEl.textContent = formatCurrency(p);

totalInterestEl.textContent = formatCurrency(totalInterest);

totalPaymentEl.textContent = formatCurrency(totalPayment);

// Update Chart

createOrUpdateChart(p, totalInterest);

// Generate and display schedule

generateSchedule(p, rAnnual, tYears, emi);

}

// Generate Collapsible Amortization Schedule, grouped by calendar year

function generateSchedule(p, rAnnual, tYears, emi) {

scheduleBody.innerHTML = ”;

let balance = p;

const rMonthly = rAnnual / 12 / 100;

const nMonths = tYears * 12;

const monthNames = [“Jan”, “Feb”, “Mar”, “Apr”, “May”, “Jun”, “Jul”, “Aug”, “Sep”, “Oct”, “Nov”, “Dec”];

const startDate = new Date();

const startMonth = startDate.getMonth(); // 0-11

const startYear = startDate.getFullYear();

// 1. Create a flat list of all monthly payments

const allPayments = [];

for (let i = 0; i < nMonths; i++) {

const interestForMonth = balance * rMonthly;

const principalForMonth = emi – interestForMonth;

balance -= principalForMonth;

const monthOffset = i;

const displayMonthIndex = (startMonth + monthOffset) % 12;

const yearOffset = Math.floor((startMonth + monthOffset) / 12);

const displayYear = startYear + yearOffset;

const displayMonthName = monthNames[displayMonthIndex];

allPayments.push({

monthName: displayMonthName,

year: displayYear,

principal: principalForMonth,

interest: interestForMonth,

total: emi,

balance: balance < 0 ? 0 : balance,

});

}

// 2. Group payments by calendar year

const groupedByYear = allPayments.reduce((acc, payment) => {

const year = payment.year;

if (!acc[year]) {

acc[year] = [];

}

acc[year].push(payment);

return acc;

}, {});

// 3. Iterate through grouped data and build HTML

for (const year in groupedByYear) {

const yearPayments = groupedByYear[year];

const yearlyPrincipal = yearPayments.reduce((sum, p) => sum + p.principal, 0);

const yearlyInterest = yearPayments.reduce((sum, p) => sum + p.interest, 0);

const yearlyTotalPayment = yearlyPrincipal + yearlyInterest;

const endOfYearBalance = yearPayments[yearPayments.length – 1].balance;

let monthlyRowsHtml = ”;

yearPayments.forEach(p => {

monthlyRowsHtml += `

<td class=”px-6 py-2 text-sm text-gray-700 font-medium”>${p.monthName}</td>

<td class=”px-6 py-2 text-sm text-gray-500 text-right”>${formatCurrency(p.principal)}</td>

<td class=”px-6 py-2 text-sm text-gray-500 text-right”>${formatCurrency(p.interest)}</td>

<td class=”px-6 py-2 text-sm text-gray-500 text-right”>${formatCurrency(p.total)}</td>

<td class=”px-6 py-2 text-sm text-gray-500 text-right”>${formatCurrency(p.balance)}</td>

</tr>

});

const yearRowHtml = `

${year}

</td>

<td class=”px-6 py-4 whitespace-nowrap text-sm text-gray-500 text-right font-medium”>${formatCurrency(yearlyPrincipal)}</td>

<td class=”px-6 py-4 whitespace-nowrap text-sm text-gray-500 text-right font-medium”>${formatCurrency(yearlyInterest)}</td>

<td class=”px-6 py-4 whitespace-nowrap text-sm text-gray-500 text-right font-medium”>${formatCurrency(yearlyTotalPayment)}</td>

<td class=”px-6 py-4 whitespace-nowrap text-sm text-gray-500 text-right font-medium”>${formatCurrency(endOfYearBalance)}</td>

</tr>

const monthlyDetailsRowHtml = `

<tr>

<th class=”px-6 py-2 text-left text-xs font-medium text-gray-600 uppercase tracking-wider”>Month</th>

<th class=”px-6 py-2 text-right text-xs font-medium text-gray-600 uppercase tracking-wider”>Principal Paid</th>

<th class=”px-6 py-2 text-right text-xs font-medium text-gray-600 uppercase tracking-wider”>Interest Paid</th>

<th class=”px-6 py-2 text-right text-xs font-medium text-gray-600 uppercase tracking-wider”>Total Payment</th>

<th class=”px-6 py-2 text-right text-xs font-medium text-gray-600 uppercase tracking-wider”>Ending Balance</th>

</tr>

</thead>

${monthlyRowsHtml}

</tbody>

</table>

</div>

</td>

</tr>

scheduleBody.innerHTML += yearRowHtml + monthlyDetailsRowHtml;

}

// Sync Sliders and Inputs

function syncInputs(slider, input, isCurrency) {

slider.addEventListener(‘input’, (e) => {

input.value = isCurrency ? formatInputCurrency(e.target.value) : e.target.value;

calculate();

});

input.addEventListener(‘change’, (e) => {

let value = parseFloat(e.target.value.replace(/,/g, ”));

const min = parseFloat(slider.min);

const max = parseFloat(slider.max);

if (isNaN(value)) value = min;

if (value < min) value = min;

if (value > max) value = max;

slider.value = value;

input.value = isCurrency ? formatInputCurrency(value) : value;

calculate();

});

}

syncInputs(amountSlider, amountInput, true);

syncInputs(interestSlider, interestInput, false);

syncInputs(tenureSlider, tenureInput, false);

// Event listener for accordion functionality

scheduleBody.addEventListener(‘click’, function(e) {

const yearRow = e.target.closest(‘.year-summary-row’);

if (!yearRow) return;

const year = yearRow.dataset.year;

const detailsRow = document.querySelector(`.monthly-details[data-details-for-year=”${year}”]`);

const icon = yearRow.querySelector(‘.expand-icon’);

if (detailsRow) {

const isHidden = detailsRow.classList.contains(‘hidden’);

detailsRow.classList.toggle(‘hidden’);

icon.textContent = isHidden ? ‘−’ : ‘+’;

icon.style.transform = isHidden ? ‘rotate(45deg)’ : ‘rotate(0deg)’;

}

});

// Initial setup

function initialize() {

amountInput.value = formatInputCurrency(amountSlider.value);

interestInput.value = interestSlider.value;

tenureInput.value = tenureSlider.value;

calculate();

}

initialize();

});

</script>

</body>

</html>

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