<title>Free Online Calculators - Financial, Math, Health & More</title> <style> :root { --primary-color: #3498db; --secondary-color: #2c3e50; --accent-color: #e74c3c; --light-color: #ecf0f1; --dark-color: #2c3e50; --shadow: 0 4px 6px rgba(0, 0, 0, 0.1); --border-radius: 8px; }

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }
    
    body {
        background-color: #f5f7fa;
        color: #333;
        line-height: 1.6;
    }
    
    .container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 15px;
    }
    
    header {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        padding: 1rem 0;
        box-shadow: var(--shadow);
        position: sticky;
        top: 0;
        z-index: 100;
    }
    
    .header-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .logo {
        font-size: 1.8rem;
        font-weight: 700;
    }
    
    .logo span {
        color: var(--accent-color);
    }
    
    nav ul {
        display: flex;
        list-style: none;
    }
    
    nav ul li {
        margin-left: 1.5rem;
    }
    
    nav ul li a {
        color: white;
        text-decoration: none;
        font-weight: 500;
        transition: color 0.3s;
    }
    
    nav ul li a:hover {
        color: var(--accent-color);
    }
    
    .mobile-menu-btn {
        display: none;
        background: none;
        border: none;
        color: white;
        font-size: 1.5rem;
        cursor: pointer;
    }
    
    .hero {
        background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
        background-size: cover;
        background-position: center;
        color: white;
        text-align: center;
        padding: 4rem 1rem;
        margin-bottom: 2rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .hero p {
        font-size: 1.2rem;
        max-width: 700px;
        margin: 0 auto 1.5rem;
    }
    
    .search-bar {
        max-width: 600px;
        margin: 0 auto;
        position: relative;
    }
    
    .search-bar input {
        width: 100%;
        padding: 12px 20px;
        border: none;
        border-radius: 50px;
        font-size: 1rem;
        box-shadow: var(--shadow);
    }
    
    .search-bar button {
        position: absolute;
        right: 5px;
        top: 5px;
        background: var(--primary-color);
        color: white;
        border: none;
        border-radius: 50px;
        padding: 7px 15px;
        cursor: pointer;
    }
    
    .categories {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1.5rem;
        margin: 2rem 0;
    }
    
    .category-card {
        background: white;
        border-radius: var(--border-radius);
        padding: 1.5rem;
        box-shadow: var(--shadow);
        transition: transform 0.3s, box-shadow 0.3s;
    }
    
    .category-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }
    
    .category-card h3 {
        color: var(--secondary-color);
        margin-bottom: 1rem;
        padding-bottom: 0.5rem;
        border-bottom: 2px solid var(--primary-color);
    }
    
    .calculator-list {
        list-style: none;
    }
    
    .calculator-list li {
        margin-bottom: 0.5rem;
    }
    
    .calculator-list a {
        color: #555;
        text-decoration: none;
        transition: color 0.3s;
        display: flex;
        align-items: center;
    }
    
    .calculator-list a:hover {
        color: var(--primary-color);
    }
    
    .calculator-list a::before {
        content: "➜";
        margin-right: 8px;
        color: var(--primary-color);
        font-size: 0.8rem;
    }
    
    .calculator-container {
        display: none;
        background: white;
        border-radius: var(--border-radius);
        padding: 2rem;
        box-shadow: var(--shadow);
        margin: 2rem 0;
    }
    
    .calculator-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
        border-bottom: 1px solid #eee;
    }
    
    .calculator-header h2 {
        color: var(--secondary-color);
    }
    
    .back-btn {
        background: var(--light-color);
        color: var(--dark-color);
        border: none;
        padding: 8px 15px;
        border-radius: var(--border-radius);
        cursor: pointer;
        display: flex;
        align-items: center;
        transition: background 0.3s;
    }
    
    .back-btn:hover {
        background: #ddd;
    }
    
    .calculator-form {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }
    
    .form-group {
        margin-bottom: 1rem;
    }
    
    .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 500;
        color: var(--secondary-color);
    }
    
    .form-group input, .form-group select {
        width: 100%;
        padding: 10px;
        border: 1px solid #ddd;
        border-radius: var(--border-radius);
        font-size: 1rem;
    }
    
    .calculate-btn {
        grid-column: span 2;
        background: var(--primary-color);
        color: white;
        border: none;
        padding: 12px;
        border-radius: var(--border-radius);
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        transition: background 0.3s;
    }
    
    .calculate-btn:hover {
        background: #2980b9;
    }
    
    .result {
        grid-column: span 2;
        background: var(--light-color);
        padding: 1.5rem;
        border-radius: var(--border-radius);
        margin-top: 1rem;
        display: none;
    }
    
    .result h3 {
        color: var(--secondary-color);
        margin-bottom: 1rem;
    }
    
    .result-item {
        display: flex;
        justify-content: space-between;
        margin-bottom: 0.5rem;
        padding-bottom: 0.5rem;
        border-bottom: 1px solid #ddd;
    }
    
    .ads {
        margin: 2rem 0;
        text-align: center;
    }
    
    .ad-unit {
        background: #f8f9fa;
        border: 1px dashed #ccc;
        padding: 20px;
        margin: 1rem 0;
        border-radius: var(--border-radius);
        min-height: 90px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    footer {
        background: var(--secondary-color);
        color: white;
        padding: 2rem 0;
        margin-top: 3rem;
    }
    
    .footer-content {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 2rem;
    }
    
    .footer-section h3 {
        margin-bottom: 1rem;
        color: var(--primary-color);
    }
    
    .footer-section ul {
        list-style: none;
    }
    
    .footer-section ul li {
        margin-bottom: 0.5rem;
    }
    
    .footer-section a {
        color: #ddd;
        text-decoration: none;
        transition: color 0.3s;
    }
    
    .footer-section a:hover {
        color: var(--primary-color);
    }
    
    .copyright {
        text-align: center;
        margin-top: 2rem;
        padding-top: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    @media (max-width: 768px) {
        .header-content {
            flex-direction: column;
            text-align: center;
        }
        
        nav ul {
            margin-top: 1rem;
            flex-wrap: wrap;
            justify-content: center;
        }
        
        nav ul li {
            margin: 0.5rem;
        }
        
        .calculator-form {
            grid-template-columns: 1fr;
        }
        
        .calculate-btn, .result {
            grid-column: 1;
        }
        
        .hero h1 {
            font-size: 2rem;
        }
    }
    
    @media (max-width: 576px) {
        .mobile-menu-btn {
            display: block;
            position: absolute;
            top: 1rem;
            right: 1rem;
        }
        
        nav {
            display: none;
            width: 100%;
            margin-top: 1rem;
        }
        
        nav.active {
            display: block;
        }
        
        nav ul {
            flex-direction: column;
        }
        
        nav ul li {
            margin: 0.5rem 0;
        }
    }
</style>

CalcHub

☰

• Financial
• Math
• Health
• Other
• Conversion

<section class="hero">
    <div class="container">
        <h1>Free Online Calculators</h1>
        <p>Calculate anything from mortgages and loans to BMI and taxes with our easy-to-use calculators</p>
        <div class="search-bar">
            <input type="text" placeholder="Search for a calculator...">
            <button>Search</button>
        </div>
    </div>
</section>

<div class="container">
    <div class="ads">
        <div class="ad-unit">
            <!-- Google AdSense Ad Unit -->
            <!-- Replace with your AdSense code -->
            <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-XXXXXXXXXXXXXXXX"
                 crossorigin="anonymous"></script>
            <ins class="adsbygoogle"
                 style="display:block"
                 data-ad-client="ca-pub-XXXXXXXXXXXXXXXX"
                 data-ad-slot="XXXXXXXXXX"
                 data-ad-format="auto"
                 data-full-width-responsive="true"></ins>
            <script>
                 (adsbygoogle = window.adsbygoogle || []).push({});
            </script>
        </div>
    </div>

    <div class="categories">
        <div class="category-card" id="financial">
            <h3>Financial Calculators</h3>
            <ul class="calculator-list">
                <li><a href="#" data-calc="mortgage">Mortgage Calculator</a></li>
                <li><a href="#" data-calc="loan">Loan Calculator</a></li>
                <li><a href="#" data-calc="auto-loan">Auto Loan Calculator</a></li>
                <li><a href="#" data-calc="interest">Interest Calculator</a></li>
                <li><a href="#" data-calc="payment">Payment Calculator</a></li>
                <li><a href="#" data-calc="retirement">Retirement Calculator</a></li>
                <li><a href="#" data-calc="amortization">Amortization Calculator</a></li>
                <li><a href="#" data-calc="investment">Investment Calculator</a></li>
                <li><a href="#" data-calc="inflation">Inflation Calculator</a></li>
                <li><a href="#" data-calc="finance">Finance Calculator</a></li>
                <li><a href="#" data-calc="income-tax">Income Tax Calculator</a></li>
                <li><a href="#" data-calc="compound-interest">Compound Interest Calculator</a></li>
                <li><a href="#" data-calc="salary">Salary Calculator</a></li>
                <li><a href="#" data-calc="interest-rate">Interest Rate Calculator</a></li>
                <li><a href="#" data-calc="sales-tax">Sales Tax Calculator</a></li>
            </ul>
        </div>

        <div class="category-card" id="math">
            <h3>Math Calculators</h3>
            <ul class="calculator-list">
                <li><a href="#" data-calc="scientific">Scientific Calculator</a></li>
                <li><a href="#" data-calc="fraction">Fraction Calculator</a></li>
                <li><a href="#" data-calc="percentage">Percentage Calculator</a></li>
                <li><a href="#" data-calc="random">Random Number Generator</a></li>
                <li><a href="#" data-calc="triangle">Triangle Calculator</a></li>
                <li><a href="#" data-calc="standard-deviation">Standard Deviation Calculator</a></li>
            </ul>
        </div>

        <div class="category-card" id="health">
            <h3>Fitness & Health Calculators</h3>
            <ul class="calculator-list">
                <li><a href="#" data-calc="bmi">BMI Calculator</a></li>
                <li><a href="#" data-calc="calorie">Calorie Calculator</a></li>
                <li><a href="#" data-calc="body-fat">Body Fat Calculator</a></li>
                <li><a href="#" data-calc="bmr">BMR Calculator</a></li>
                <li><a href="#" data-calc="ideal-weight">Ideal Weight Calculator</a></li>
                <li><a href="#" data-calc="pace">Pace Calculator</a></li>
                <li><a href="#" data-calc="pregnancy">Pregnancy Calculator</a></li>
                <li><a href="#" data-calc="conception">Pregnancy Conception Calculator</a></li>
                <li><a href="#" data-calc="due-date">Due Date Calculator</a></li>
            </ul>
        </div>

        <div class="category-card" id="other">
            <h3>Other Calculators</h3>
            <ul class="calculator-list">
                <li><a href="#" data-calc="age">Age Calculator</a></li>
                <li><a href="#" data-calc="date">Date Calculator</a></li>
                <li><a href="#" data-calc="time">Time Calculator</a></li>
                <li><a href="#" data-calc="hours">Hours Calculator</a></li>
                <li><a href="#" data-calc="gpa">GPA Calculator</a></li>
                <li><a href="#" data-calc="grade">Grade Calculator</a></li>
                <li><a href="#" data-calc="concrete">Concrete Calculator</a></li>
                <li><a href="#" data-calc="subnet">Subnet Calculator</a></li>
            </ul>
        </div>

        <div class="category-card" id="conversion">
            <h3>Conversion Calculators</h3>
            <ul class="calculator-list">
                <li><a href="#" data-calc="length">Length Converter</a></li>
                <li><a href="#" data-calc="weight">Weight Converter</a></li>
                <li><a href="#" data-calc="temperature">Temperature Converter</a></li>
                <li><a href="#" data-calc="currency">Currency Converter</a></li>
                <li><a href="#" data-calc="area">Area Converter</a></li>
                <li><a href="#" data-calc="volume">Volume Converter</a></li>
            </ul>
        </div>
    </div>

    <div class="calculator-container" id="calculator-display">
        <div class="calculator-header">
            <h2 id="calculator-title">Calculator</h2>
            <button class="back-btn" id="back-to-categories">← Back to Categories</button>
        </div>
        <div id="calculator-content">
            <!-- Calculator forms will be dynamically inserted here -->
        </div>
    </div>

    <div class="ads">
        <div class="ad-unit">
            <!-- Google AdSense Ad Unit -->
            <!-- Replace with your AdSense code -->
            <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-XXXXXXXXXXXXXXXX"
                 crossorigin="anonymous"></script>
            <ins class="adsbygoogle"
                 style="display:block"
                 data-ad-client="ca-pub-XXXXXXXXXXXXXXXX"
                 data-ad-slot="XXXXXXXXXX"
                 data-ad-format="auto"
                 data-full-width-responsive="true"></ins>
            <script>
                 (adsbygoogle = window.adsbygoogle || []).push({});
            </script>
        </div>
    </div>
</div>

<footer>
    <div class="container">
        <div class="footer-content">
            <div class="footer-section">
                <h3>About CalcHub</h3>
                <p>CalcHub provides free online calculators for various purposes including finance, math, health, and more. Our tools are designed to be user-friendly and accurate.</p>
            </div>
            <div class="footer-section">
                <h3>Quick Links</h3>
                <ul>
                    <li><a href="#financial">Financial Calculators</a></li>
                    <li><a href="#math">Math Calculators</a></li>
                    <li><a href="#health">Health Calculators</a></li>
                    <li><a href="#other">Other Calculators</a></li>
                </ul>
            </div>
            <div class="footer-section">
                <h3>Legal</h3>
                <ul>
                    <li><a href="#">Privacy Policy</a></li>
                    <li><a href="#">Terms of Service</a></li>
                    <li><a href="#">Disclaimer</a></li>
                </