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<!DOCTYPE html>
<html lang="en" class="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Matrix Calculators - Modern & Dark</title>
<script src="https://cdn.tailwindcss.com"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css">
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap" rel="stylesheet">
<style>
body {
font-family: 'Poppins', sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #1e293b; }
::-webkit-scrollbar-thumb { background: #475569; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #64748b; }
.fade-in { animation: fadeInAnimation 0.5s ease-in-out; }
@keyframes fadeInAnimation {
from { opacity: 0; transform: translateY(15px); }
to { opacity: 1; transform: translateY(0); }
}
input[type="date"]::-webkit-calendar-picker-indicator {
filter: invert(0.8);
cursor: pointer;
}
</style>
</head>
<body class="bg-slate-900 text-slate-200 flex justify-center items-start min-h-screen p-4 sm:p-8">
<div class="w-full max-w-6xl">
<div id="dashboard" class="fade-in">
<header class="text-center mb-10">
<h1 class="text-4xl md:text-5xl font-bold text-white">Matrix Calculators</h1>
<p class="text-lg text-slate-400 mt-2">Your ultimate suite of calculators and converters for everyday life</p>
</header>
<main class="grid grid-cols-1 md:grid-cols-2 gap-6 lg:gap-8">
<div class="bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 border-t-4 border-green-500 transition-transform duration-300 hover:-translate-y-2">
<div class="flex items-center gap-4 mb-5">
<i class="fa-solid fa-coins text-3xl text-green-400"></i>
<h2 class="font-semibold text-2xl text-white">Finance Calculators</h2>
</div>
<div class="space-y-3">
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('emi')">
<strong class="font-semibold text-slate-100">EMI Calculator</strong>
<small class="text-sm text-slate-400 block mt-1">Calculate loan EMIs with sliders</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('gst')">
<strong class="font-semibold text-slate-100">GST/VAT Calculator</strong>
<small class="text-sm text-slate-400 block mt-1">Add or remove tax from amounts</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('split')">
<strong class="font-semibold text-slate-100">Bill Splitter</strong>
<small class="text-sm text-slate-400 block mt-1">Split restaurant bills with friends</small>
</div>
</div>
</div>
<div class="bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 border-t-4 border-red-500 transition-transform duration-300 hover:-translate-y-2">
<div class="flex items-center gap-4 mb-5">
<i class="fa-solid fa-heart-pulse text-3xl text-red-400"></i>
<h2 class="font-semibold text-2xl text-white">Health & Fitness</h2>
</div>
<div class="space-y-3">
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('bmi')">
<strong class="font-semibold text-slate-100">BMI Calculator</strong>
<small class="text-sm text-slate-400 block mt-1">Body Mass Index with visual gauge</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('calorie')">
<strong class="font-semibold text-slate-100">Calorie Calculator</strong>
<small class="text-sm text-slate-400 block mt-1">BMR & TDEE needs</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('bodyfat')">
<strong class="font-semibold text-slate-100">Body Fat Calculator</strong>
<small class="text-sm text-slate-400 block mt-1">Estimate your body fat percentage</small>
</div>
</div>
</div>
<div class="bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 border-t-4 border-blue-500 transition-transform duration-300 hover:-translate-y-2">
<div class="flex items-center gap-4 mb-5">
<i class="fa-solid fa-arrows-rotate text-3xl text-blue-400"></i>
<h2 class="font-semibold text-2xl text-white">Unit Converters</h2>
</div>
<div class="space-y-3">
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('converter', 'length')">
<strong class="font-semibold text-slate-100">Length Converter</strong>
<small class="text-sm text-slate-400 block mt-1">Meters, Feet, Inches, Miles...</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('converter', 'weight')">
<strong class="font-semibold text-slate-100">Weight Converter</strong>
<small class="text-sm text-slate-400 block mt-1">Kilograms, Pounds, Ounces...</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('converter', 'temperature')">
<strong class="font-semibold text-slate-100">Temperature Converter</strong>
<small class="text-sm text-slate-400 block mt-1">Celsius, Fahrenheit, Kelvin</small>
</div>
</div>
</div>
<div class="bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 border-t-4 border-purple-500 transition-transform duration-300 hover:-translate-y-2">
<div class="flex items-center gap-4 mb-5">
<i class="fa-solid fa-calendar-days text-3xl text-purple-400"></i>
<h2 class="font-semibold text-2xl text-white">Date & Time Tools</h2>
</div>
<div class="space-y-3">
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('age')">
<strong class="font-semibold text-slate-100">Age Calculator</strong>
<small class="text-sm text-slate-400 block mt-1">Calculate exact age from birth date</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('dateDiff')">
<strong class="font-semibold text-slate-100">Date Difference</strong>
<small class="text-sm text-slate-400 block mt-1">Days, weeks, months between dates</small>
</div>
<div class="bg-slate-700/50 p-4 rounded-lg cursor-pointer hover:bg-slate-700 transition" onclick="showCalculator('dateAdd')">
<strong class="font-semibold text-slate-100">Add/Subtract Dates</strong>
<small class="text-sm text-slate-400 block mt-1">Calculate a future or past date</small>
</div>
</div>
</div>
</main>
</div>
<div id="calculator-container" class="w-full"></div>
</div>
<script>
// --- JAVASCRIPT LOGIC ---
const dashboard = document.getElementById('dashboard');
const calculatorContainer = document.getElementById('calculator-container');
const formatCurrency = (num, digits = 2) => `₹ ${num.toLocaleString('en-IN', { minimumFractionDigits: digits, maximumFractionDigits: digits })}`;
// Generic back button for all calculators
const backButton = `<button onclick="showDashboard()" class="absolute top-4 left-4 bg-slate-700 hover:bg-slate-600 text-white font-bold py-2 px-4 rounded-full transition duration-300"><i class="fas fa-arrow-left"></i></button>`;
const calculators = {
// --- Finance Calculators ---
emi: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-green-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-green-400">EMI Calculator</h2>
<div class="space-y-6">
<div>
<label class="text-slate-300 font-semibold">Loan Amount: <span id="amount-val" class="font-bold text-green-400"></span></label>
<input type="range" id="amount" min="10000" max="10000000" value="500000" class="w-full h-2 bg-slate-700 rounded-lg appearance-none cursor-pointer">
</div>
<div>
<label class="text-slate-300 font-semibold">Interest Rate (% p.a.): <span id="rate-val" class="font-bold text-green-400"></span></label>
<input type="range" id="rate" min="1" max="20" value="8.5" step="0.1" class="w-full h-2 bg-slate-700 rounded-lg appearance-none cursor-pointer">
</div>
<div>
<label class="text-slate-300 font-semibold">Tenure (Months): <span id="tenure-val" class="font-bold text-green-400"></span></label>
<input type="range" id="tenure" min="6" max="360" value="120" class="w-full h-2 bg-slate-700 rounded-lg appearance-none cursor-pointer">
</div>
</div>
<div id="emi-result" class="text-center mt-8 bg-slate-900 p-6 rounded-lg"></div>
</div>
`,
init: function() {
const amountSlider = document.getElementById('amount');
const rateSlider = document.getElementById('rate');
const tenureSlider = document.getElementById('tenure');
const calculateEMI = () => {
const p = parseFloat(amountSlider.value);
const r = parseFloat(rateSlider.value) / 12 / 100;
const n = parseFloat(tenureSlider.value);
document.getElementById('amount-val').textContent = formatCurrency(p, 0);
document.getElementById('rate-val').textContent = `${rateSlider.value}%`;
document.getElementById('tenure-val').textContent = `${n} months`;
if (r === 0) {
document.getElementById('emi-result').innerHTML = `<p class="text-lg text-slate-400">Monthly EMI:</p><p class="text-4xl font-bold text-white">${formatCurrency(p/n)}</p>`;
return;
}
const emi = p * r * (Math.pow(1 + r, n)) / (Math.pow(1 + r, n) - 1);
const totalPayable = emi * n;
const totalInterest = totalPayable - p;
document.getElementById('emi-result').innerHTML = `
<p class="text-lg text-slate-400">Monthly EMI:</p>
<p class="text-4xl font-bold text-white mb-4">${formatCurrency(emi)}</p>
<div class="flex justify-around text-center">
<div>
<p class="text-slate-400 text-sm">Total Interest</p>
<p class="text-lg font-semibold text-red-400">${formatCurrency(totalInterest)}</p>
</div>
<div>
<p class="text-slate-400 text-sm">Total Payment</p>
<p class="text-lg font-semibold text-green-400">${formatCurrency(totalPayable)}</p>
</div>
</div>
`;
};
[amountSlider, rateSlider, tenureSlider].forEach(el => el.addEventListener('input', calculateEMI));
calculateEMI();
}
},
gst: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-green-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-green-400">GST/VAT Calculator</h2>
<div class="space-y-4">
<div>
<label for="gst-amount" class="text-slate-300 font-semibold block mb-2">Amount</label>
<input type="number" id="gst-amount" placeholder="Enter amount" class="w-full bg-slate-700 border-2 border-slate-600 rounded-lg p-3 text-white focus:outline-none focus:border-green-500">
</div>
<div>
<label for="gst-rate" class="text-slate-300 font-semibold block mb-2">GST/VAT Rate (%)</label>
<input type="number" id="gst-rate" value="18" class="w-full bg-slate-700 border-2 border-slate-600 rounded-lg p-3 text-white focus:outline-none focus:border-green-500">
</div>
<div class="flex gap-4">
<button id="add-gst" class="w-full bg-green-600 hover:bg-green-700 text-white font-bold py-3 rounded-lg transition">Add GST</button>
<button id="remove-gst" class="w-full bg-red-600 hover:bg-red-700 text-white font-bold py-3 rounded-lg transition">Remove GST</button>
</div>
</div>
<div id="gst-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg min-h-[100px] flex flex-col justify-center"></div>
</div>
`,
init: function() {
const amountInput = document.getElementById('gst-amount');
const rateInput = document.getElementById('gst-rate');
const resultDiv = document.getElementById('gst-result');
document.getElementById('add-gst').addEventListener('click', () => {
const amount = parseFloat(amountInput.value);
const rate = parseFloat(rateInput.value);
if (isNaN(amount) || isNaN(rate)) {
resultDiv.innerHTML = `<p class="text-red-400">Please enter valid amount and rate.</p>`;
return;
}
const tax = amount * (rate / 100);
const total = amount + tax;
resultDiv.innerHTML = `
<p class="text-slate-400">Tax Amount: <span class="font-semibold text-white">${formatCurrency(tax)}</span></p>
<p class="text-slate-400">Total Amount (incl. GST): <span class="font-semibold text-2xl text-green-400">${formatCurrency(total)}</span></p>
`;
});
document.getElementById('remove-gst').addEventListener('click', () => {
const amount = parseFloat(amountInput.value);
const rate = parseFloat(rateInput.value);
if (isNaN(amount) || isNaN(rate)) {
resultDiv.innerHTML = `<p class="text-red-400">Please enter valid amount and rate.</p>`;
return;
}
const originalAmount = amount / (1 + rate / 100);
const tax = amount - originalAmount;
resultDiv.innerHTML = `
<p class="text-slate-400">Base Amount: <span class="font-semibold text-2xl text-green-400">${formatCurrency(originalAmount)}</span></p>
<p class="text-slate-400">Tax Amount (GST): <span class="font-semibold text-white">${formatCurrency(tax)}</span></p>
`;
});
}
},
split: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-green-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-green-400">Bill Splitter</h2>
<div class="space-y-4">
<input type="number" id="bill-total" placeholder="Total Bill Amount" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-green-500">
<input type="number" id="bill-people" placeholder="Number of People" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-green-500">
<div>
<label class="text-slate-300 font-semibold">Tip: <span id="bill-tip-val" class="font-bold text-green-400">10%</span></label>
<input type="range" id="bill-tip" min="0" max="50" value="10" class="w-full h-2 bg-slate-700 rounded-lg appearance-none cursor-pointer">
</div>
<button id="split-bill-btn" class="w-full bg-green-600 hover:bg-green-700 text-white font-bold py-3 rounded-lg transition">Calculate</button>
</div>
<div id="split-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg min-h-[100px] flex flex-col justify-center"></div>
</div>
`,
init: function() {
const totalInput = document.getElementById('bill-total');
const peopleInput = document.getElementById('bill-people');
const tipSlider = document.getElementById('bill-tip');
const tipVal = document.getElementById('bill-tip-val');
const resultDiv = document.getElementById('split-result');
tipSlider.addEventListener('input', () => tipVal.textContent = `${tipSlider.value}%`);
document.getElementById('split-bill-btn').addEventListener('click', () => {
const total = parseFloat(totalInput.value);
const people = parseInt(peopleInput.value);
const tipPercent = parseFloat(tipSlider.value);
if (isNaN(total) || isNaN(people) || total <= 0 || people <= 0) {
resultDiv.innerHTML = `<p class="text-red-400">Please enter a valid bill amount and number of people.</p>`;
return;
}
const tipAmount = total * (tipPercent / 100);
const finalTotal = total + tipAmount;
const perPerson = finalTotal / people;
resultDiv.innerHTML = `
<p class="text-slate-400">Total Bill (incl. tip): <span class="font-semibold text-white">${formatCurrency(finalTotal)}</span></p>
<p class="text-slate-400">Each person pays:</p>
<p class="text-3xl font-bold text-green-400">${formatCurrency(perPerson)}</p>
`;
});
}
},
// --- Health Calculators ---
bmi: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-red-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-red-400">BMI Calculator</h2>
<div class="flex justify-center mb-4">
<div class="bg-slate-700 p-1 rounded-full flex gap-1">
<button id="bmi-metric" class="px-4 py-2 rounded-full font-semibold bg-red-500 text-white">Metric</button>
<button id="bmi-imperial" class="px-4 py-2 rounded-full font-semibold text-slate-300">Imperial</button>
</div>
</div>
<div id="bmi-inputs" class="space-y-4"></div>
<div id="bmi-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg min-h-[100px]"></div>
</div>
`,
init: function() {
const metricBtn = document.getElementById('bmi-metric');
const imperialBtn = document.getElementById('bmi-imperial');
const inputsDiv = document.getElementById('bmi-inputs');
const resultDiv = document.getElementById('bmi-result');
let unit = 'metric';
const metricTemplate = `
<input type="number" id="cm" placeholder="Height (cm)" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-red-500">
<input type="number" id="kg" placeholder="Weight (kg)" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-red-500">
`;
const imperialTemplate = `
<div class="flex gap-4">
<input type="number" id="ft" placeholder="Height (ft)" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-red-500">
<input type="number" id="in" placeholder="Height (in)" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-red-500">
</div>
<input type="number" id="lbs" placeholder="Weight (lbs)" class="w-full bg-slate-700 p-3 rounded-lg text-white focus:outline-none focus:border-red-500">
`;
const calculateBMI = () => {
let bmi;
if (unit === 'metric') {
const cm = parseFloat(document.getElementById('cm').value);
const kg = parseFloat(document.getElementById('kg').value);
if (!cm || !kg || cm <= 0 || kg <= 0) return;
bmi = kg / Math.pow(cm / 100, 2);
} else {
const ft = parseFloat(document.getElementById('ft').value) || 0;
const inches = parseFloat(document.getElementById('in').value) || 0;
const lbs = parseFloat(document.getElementById('lbs').value);
const totalInches = (ft * 12) + inches;
if (!totalInches || !lbs || totalInches <= 0 || lbs <= 0) return;
bmi = (lbs / Math.pow(totalInches, 2)) * 703;
}
if (isNaN(bmi)) return;
let category = '';
let color = '';
if (bmi < 18.5) { category = 'Underweight'; color = 'text-blue-400'; }
else if (bmi < 25) { category = 'Normal weight'; color = 'text-green-400'; }
else if (bmi < 30) { category = 'Overweight'; color = 'text-yellow-400'; }
else { category = 'Obese'; color = 'text-red-400'; }
resultDiv.innerHTML = `
<p class="text-slate-400">Your BMI:</p>
<p class="text-4xl font-bold text-white">${bmi.toFixed(1)}</p>
<p class="text-xl font-semibold ${color}">${category}</p>
`;
};
const setupInputs = () => {
inputsDiv.innerHTML = unit === 'metric' ? metricTemplate : imperialTemplate;
resultDiv.innerHTML = '';
inputsDiv.querySelectorAll('input').forEach(el => el.addEventListener('input', calculateBMI));
};
metricBtn.addEventListener('click', () => {
unit = 'metric';
metricBtn.classList.add('bg-red-500', 'text-white');
imperialBtn.classList.remove('bg-red-500', 'text-white');
setupInputs();
});
imperialBtn.addEventListener('click', () => {
unit = 'imperial';
imperialBtn.classList.add('bg-red-500', 'text-white');
metricBtn.classList.remove('bg-red-500', 'text-white');
setupInputs();
});
setupInputs();
}
},
calorie: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-red-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-red-400">Calorie Calculator (BMR & TDEE)</h2>
<div class="grid md:grid-cols-2 gap-4">
<input type="number" id="cal-age" placeholder="Age" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<select id="cal-gender" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<option value="male">Male</option>
<option value="female">Female</option>
</select>
<input type="number" id="cal-height" placeholder="Height (cm)" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<input type="number" id="cal-weight" placeholder="Weight (kg)" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<select id="cal-activity" class="w-full bg-slate-700 p-3 rounded-lg text-white md:col-span-2">
<option value="1.2">Sedentary (little or no exercise)</option>
<option value="1.375">Lightly active (light exercise/sports 1-3 days/week)</option>
<option value="1.55">Moderately active (moderate exercise/sports 3-5 days/week)</option>
<option value="1.725">Very active (hard exercise/sports 6-7 days a week)</option>
<option value="1.9">Extra active (very hard exercise/sports & physical job)</option>
</select>
<button id="cal-calculate" class="w-full bg-red-600 hover:bg-red-700 text-white font-bold py-3 rounded-lg transition md:col-span-2">Calculate</button>
</div>
<div id="cal-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg"></div>
</div>`,
init: function() {
document.getElementById('cal-calculate').addEventListener('click', () => {
const age = parseFloat(document.getElementById('cal-age').value);
const gender = document.getElementById('cal-gender').value;
const height = parseFloat(document.getElementById('cal-height').value);
const weight = parseFloat(document.getElementById('cal-weight').value);
const activity = parseFloat(document.getElementById('cal-activity').value);
const resultDiv = document.getElementById('cal-result');
if (!age || !height || !weight) {
resultDiv.innerHTML = `<p class="text-red-400">Please fill all fields.</p>`;
return;
}
let bmr;
if (gender === 'male') {
bmr = 10 * weight + 6.25 * height - 5 * age + 5;
} else {
bmr = 10 * weight + 6.25 * height - 5 * age - 161;
}
const tdee = bmr * activity;
resultDiv.innerHTML = `
<p class="text-slate-400">Your Basal Metabolic Rate (BMR) is:</p>
<p class="text-2xl font-bold text-white">${bmr.toFixed(0)} Calories/day</p>
<p class="text-slate-400 mt-4">Your Total Daily Energy Expenditure (TDEE) is:</p>
<p class="text-3xl font-bold text-red-400">${tdee.toFixed(0)} Calories/day</p>
`;
});
}
},
bodyfat: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-red-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-red-400">Body Fat Calculator (Navy Method)</h2>
<div class="grid md:grid-cols-2 gap-4">
<select id="bf-gender" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<option value="male">Male</option>
<option value="female">Female</option>
</select>
<input type="number" id="bf-height" placeholder="Height (cm)" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<input type="number" id="bf-neck" placeholder="Neck (cm)" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<input type="number" id="bf-waist" placeholder="Waist (cm)" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<div id="bf-female-only" class="md:col-span-2 hidden">
<input type="number" id="bf-hip" placeholder="Hip (cm)" class="w-full bg-slate-700 p-3 rounded-lg text-white mt-4">
</div>
<button id="bf-calculate" class="w-full bg-red-600 hover:bg-red-700 text-white font-bold py-3 rounded-lg transition md:col-span-2">Calculate</button>
</div>
<div id="bf-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg"></div>
</div>`,
init: function() {
const genderSelect = document.getElementById('bf-gender');
const femaleOnlyDiv = document.getElementById('bf-female-only');
genderSelect.addEventListener('change', () => {
femaleOnlyDiv.classList.toggle('hidden', genderSelect.value === 'male');
});
document.getElementById('bf-calculate').addEventListener('click', () => {
const gender = genderSelect.value;
const height = parseFloat(document.getElementById('bf-height').value);
const neck = parseFloat(document.getElementById('bf-neck').value);
const waist = parseFloat(document.getElementById('bf-waist').value);
const resultDiv = document.getElementById('bf-result');
let bfp;
if (!height || !neck || !waist) {
resultDiv.innerHTML = `<p class="text-red-400">Please fill all required fields.</p>`;
return;
}
if (gender === 'male') {
bfp = 495 / (1.0324 - 0.19077 * Math.log10(waist - neck) + 0.15456 * Math.log10(height)) - 450;
} else {
const hip = parseFloat(document.getElementById('bf-hip').value);
if (!hip) {
resultDiv.innerHTML = `<p class="text-red-400">Please fill all required fields.</p>`;
return;
}
bfp = 495 / (1.29579 - 0.35004 * Math.log10(waist + hip - neck) + 0.22100 * Math.log10(height)) - 450;
}
if (isNaN(bfp) || bfp < 0) {
resultDiv.innerHTML = `<p class="text-red-400">Could not calculate. Please check your measurements.</p>`;
} else {
resultDiv.innerHTML = `
<p class="text-slate-400">Estimated Body Fat:</p>
<p class="text-4xl font-bold text-red-400">${bfp.toFixed(1)}%</p>
`;
}
});
}
},
// --- Converters ---
converter: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-blue-500 relative max-w-2xl mx-auto">
${backButton}
<h2 id="converter-title" class="text-2xl font-bold text-center mb-6 text-blue-400"></h2>
<div class="grid grid-cols-1 md:grid-cols-2 gap-4 items-center">
<div>
<select id="from-unit" class="w-full bg-slate-700 p-3 rounded-lg text-white"></select>
<input type="number" id="from-value" placeholder="Enter value" class="w-full bg-slate-700 p-3 rounded-lg text-white mt-2">
</div>
<div>
<select id="to-unit" class="w-full bg-slate-700 p-3 rounded-lg text-white"></select>
<input type="text" id="to-value" readonly class="w-full bg-slate-900 p-3 rounded-lg text-white mt-2 font-bold text-xl">
</div>
</div>
</div>
`,
init: function(type) {
const units = {
length: { name: 'Length Converter', base: 'meter', list: { meter: 1, kilometer: 1000, centimeter: 0.01, millimeter: 0.001, mile: 1609.34, yard: 0.9144, foot: 0.3048, inch: 0.0254 } },
weight: { name: 'Weight Converter', base: 'kilogram', list: { kilogram: 1, gram: 0.001, milligram: 1e-6, ton: 1000, pound: 0.453592, ounce: 0.0283495 } },
temperature: { name: 'Temperature Converter', base: 'celsius', list: { celsius: 'C', fahrenheit: 'F', kelvin: 'K' } }
};
const config = units[type];
document.getElementById('converter-title').textContent = config.name;
const fromUnit = document.getElementById('from-unit');
const toUnit = document.getElementById('to-unit');
const fromValue = document.getElementById('from-value');
Object.keys(config.list).forEach(unit => {
fromUnit.innerHTML += `<option value="${unit}">${unit}</option>`;
toUnit.innerHTML += `<option value="${unit}">${unit}</option>`;
});
fromUnit.value = Object.keys(config.list)[0];
toUnit.value = Object.keys(config.list)[1];
const convert = () => {
const from = fromValue.value;
if (from === '' || isNaN(from)) {
document.getElementById('to-value').value = '';
return;
}
let result;
if (type === 'temperature') {
const fromU = fromUnit.value;
const toU = toUnit.value;
const val = parseFloat(from);
if (fromU === toU) { result = val; }
else if (fromU === 'celsius' && toU === 'fahrenheit') { result = (val * 9/5) + 32; }
else if (fromU === 'celsius' && toU === 'kelvin') { result = val + 273.15; }
else if (fromU === 'fahrenheit' && toU === 'celsius') { result = (val - 32) * 5/9; }
else if (fromU === 'fahrenheit' && toU === 'kelvin') { result = (val - 32) * 5/9 + 273.15; }
else if (fromU === 'kelvin' && toU === 'celsius') { result = val - 273.15; }
else if (fromU === 'kelvin' && toU === 'fahrenheit') { result = (val - 273.15) * 9/5 + 32; }
} else {
const inBase = from * config.list[fromUnit.value];
result = inBase / config.list[toUnit.value];
}
document.getElementById('to-value').value = result.toFixed(type === 'temperature' ? 2 : 4);
};
[fromUnit, toUnit, fromValue].forEach(el => el.addEventListener('change', convert));
fromValue.addEventListener('input', convert);
}
},
// --- Date & Time ---
age: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-purple-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-purple-400">Age Calculator</h2>
<div class="grid md:grid-cols-2 gap-4">
<div>
<label for="birth-date" class="text-slate-300 font-semibold block mb-2">Your Date of Birth</label>
<input type="date" id="birth-date" class="w-full bg-slate-700 p-3 rounded-lg text-white">
</div>
<div>
<label for="current-date" class="text-slate-300 font-semibold block mb-2">Age at the Date of</label>
<input type="date" id="current-date" class="w-full bg-slate-700 p-3 rounded-lg text-white">
</div>
<button id="age-calculate" class="w-full bg-purple-600 hover:bg-purple-700 text-white font-bold py-3 rounded-lg transition md:col-span-2">Calculate Age</button>
</div>
<div id="age-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg"></div>
</div>
`,
init: function() {
const today = new Date().toISOString().split('T')[0];
document.getElementById('current-date').value = today;
document.getElementById('age-calculate').addEventListener('click', () => {
const birthDate = new Date(document.getElementById('birth-date').value);
const currentDate = new Date(document.getElementById('current-date').value);
const resultDiv = document.getElementById('age-result');
if (isNaN(birthDate.getTime()) || isNaN(currentDate.getTime())) {
resultDiv.innerHTML = `<p class="text-red-400">Please select valid dates.</p>`;
return;
}
if (birthDate > currentDate) {
resultDiv.innerHTML = `<p class="text-red-400">Birth date cannot be in the future.</p>`;
return;
}
let years = currentDate.getFullYear() - birthDate.getFullYear();
let months = currentDate.getMonth() - birthDate.getMonth();
let days = currentDate.getDate() - birthDate.getDate();
if (days < 0) {
months--;
days += new Date(currentDate.getFullYear(), currentDate.getMonth(), 0).getDate();
}
if (months < 0) {
years--;
months += 12;
}
resultDiv.innerHTML = `
<p class="text-slate-400">Your Age is</p>
<p class="text-3xl font-bold text-purple-400">${years} <span class="text-xl">years</span> ${months} <span class="text-xl">months</span> ${days} <span class="text-xl">days</span></p>
`;
});
}
},
dateDiff: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-purple-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-purple-400">Date Difference</h2>
<div class="grid md:grid-cols-2 gap-4">
<div>
<label for="start-date" class="text-slate-300 font-semibold block mb-2">Start Date</label>
<input type="date" id="start-date" class="w-full bg-slate-700 p-3 rounded-lg text-white">
</div>
<div>
<label for="end-date" class="text-slate-300 font-semibold block mb-2">End Date</label>
<input type="date" id="end-date" class="w-full bg-slate-700 p-3 rounded-lg text-white">
</div>
</div>
<div id="date-diff-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg"></div>
</div>
`,
init: function() {
const startDateInput = document.getElementById('start-date');
const endDateInput = document.getElementById('end-date');
const resultDiv = document.getElementById('date-diff-result');
const calculateDiff = () => {
const startDate = new Date(startDateInput.value);
const endDate = new Date(endDateInput.value);
if (isNaN(startDate.getTime()) || isNaN(endDate.getTime())) {
resultDiv.innerHTML = '';
return;
}
const diffTime = Math.abs(endDate - startDate);
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
resultDiv.innerHTML = `
<p class="text-slate-400">Difference:</p>
<p class="text-3xl font-bold text-purple-400">${diffDays} days</p>
<p class="text-lg text-white">~${(diffDays/7).toFixed(1)} weeks | ~${(diffDays/30.44).toFixed(1)} months</p>
`;
};
startDateInput.addEventListener('change', calculateDiff);
endDateInput.addEventListener('change', calculateDiff);
}
},
dateAdd: {
template: `
<div class="fade-in bg-slate-800/70 backdrop-blur-sm rounded-xl shadow-lg p-6 lg:p-8 border-t-4 border-purple-500 relative max-w-2xl mx-auto">
${backButton}
<h2 class="text-2xl font-bold text-center mb-6 text-purple-400">Add / Subtract Dates</h2>
<div>
<label for="start-date-add" class="text-slate-300 font-semibold block mb-2">Start Date</label>
<input type="date" id="start-date-add" class="w-full bg-slate-700 p-3 rounded-lg text-white mb-4">
</div>
<div class="grid grid-cols-3 gap-2">
<input type="number" id="add-years" placeholder="Years" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<input type="number" id="add-months" placeholder="Months" class="w-full bg-slate-700 p-3 rounded-lg text-white">
<input type="number" id="add-days" placeholder="Days" class="w-full bg-slate-700 p-3 rounded-lg text-white">
</div>
<div class="flex gap-4 mt-4">
<button id="add-date-btn" class="w-full bg-purple-600 hover:bg-purple-700 text-white font-bold py-3 rounded-lg transition">Add</button>
<button id="sub-date-btn" class="w-full bg-purple-800 hover:bg-purple-900 text-white font-bold py-3 rounded-lg transition">Subtract</button>
</div>
<div id="date-add-result" class="text-center mt-6 bg-slate-900 p-4 rounded-lg"></div>
</div>
`,
init: function() {
const startDateInput = document.getElementById('start-date-add');
startDateInput.value = new Date().toISOString().split('T')[0];
const resultDiv = document.getElementById('date-add-result');
const calculate = (multiplier) => {
const startDate = new Date(startDateInput.value);
if(isNaN(startDate.getTime())) {
resultDiv.innerHTML = `<p class="text-red-400">Please select a valid start date.</p>`;
return;
}
const years = parseInt(document.getElementById('add-years').value) || 0;
const months = parseInt(document.getElementById('add-months').value) || 0;
const days = parseInt(document.getElementById('add-days').value) || 0;
startDate.setFullYear(startDate.getFullYear() + years * multiplier);
startDate.setMonth(startDate.getMonth() + months * multiplier);
startDate.setDate(startDate.getDate() + days * multiplier);
const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
resultDiv.innerHTML = `
<p class="text-slate-400">Resulting Date:</p>
<p class="text-3xl font-bold text-purple-400">${startDate.toLocaleDateString('en-US', options)}</p>
`;
};
document.getElementById('add-date-btn').addEventListener('click', () => calculate(1));
document.getElementById('sub-date-btn').addEventListener('click', () => calculate(-1));
}
}
};
function showDashboard() {
calculatorContainer.innerHTML = '';
dashboard.classList.remove('hidden');
dashboard.classList.add('fade-in');
}
function showCalculator(calcName, subType = null) {
dashboard.classList.add('hidden');
const calc = calculators[calcName];
if (calc) {
calculatorContainer.innerHTML = calc.template;
calc.init(subType);
}
}
</script>
</body>
</html> |
