A simple yearly interest calculator is written in JavaScript to solve the loan of the customer.

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Program Listing

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #7A819F;
            color: #2B2E3E;
            font-family: sans-serif;
        main {
            padding: 50px;
            border-radius: 10px;
            background-color: #D9D4D0;
            min-width: 500px;
        h1 {
            margin-bottom: 5px;
            font-size: 28px;
            text-align: center;
        h2 {
            margin-bottom: 30px;
            font-size: 20px;
            text-align: center;
        .block {
            margin: 0 auto 12px;
            display: flex;
            align-items: center;

        label {
            display: block;
            width: 35%;
            line-height: 40px;
            background-color: #47356E;
            color: #eee;
            text-align: center;
        input {
            padding: 10px;
            width: 65%;
            font-size: 14px;
            border-radius: 0 5px 5px 0;
            border: 2px solid #000;
            outline: none;
        .btnBlock {
            display: flex;
            width: 100%;
        .btn {
            display: inline-block;
            padding: 15px;
            background-color: #CD8F3C;
            color: #fff;
            outline: none; 
            border: none;
            cursor: pointer;
            width: 150px;
            width: 50%;
            font-size: 16px;
            text-decoration: none;
            text-align: center;
            transition: all .2s;
        .btnReset {
            background-color: #6B838E;
        .btn:hover {
            opacity: 0.9;
        .total {
            display: block;
            width: 100%;
            margin-top: 12px;
            padding: 20px 0;
            background-color: #2F4C58;
            font-size: 16px;
            color: #f3f3f3;
            line-height: 1.5;
        .hide {
            display: none;
    <main class="container">
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <form action="" id="frmCalc">
            <div class="block">
                <label for="grade1">Principal Amount:</label>
                <input type="number" min="1" id="principal" autofocus required>
            <div class="block">
                <label for="grade2">Interest Rate (%):</label>
                <input type="number" min="0" max="100" id="rate" required>
            <div class="block">
                <label for="grade3">Time in years:</label>
                <input type="number" id="time" required>
            <div class="btnBlock">
                <button type="submit" class="btn">CALCULATE</button>
                <a href="" class="btn btnReset">RESET</a>
            <div class="total hide"></div>

        document.querySelector('#frmCalc').onsubmit  = (e) => {
            let total = document.querySelector('.total'),
                interest = document.querySelector('.interest'),
                inputs = document.querySelectorAll('input[type="number"]'),
                calc = 1,
                monthly = 0;
            calc = (inputs[0].value * inputs[1].value)/100;
            totalAmount = parseInt(inputs[0].value) + parseInt(calc);
            monthly = totalAmount/(inputs[2].value * 12);
            total.innerHTML = 'Total Amount is: '+totalAmount.toFixed(2)+'<br>'+
                            'Monthly Payment is: '+monthly.toFixed(2)+'<br>'+
                            'Total Interest is: '+calc.toFixed(2)