:root { --dog-color: #4a6fa5; --cat-color: #9d65c9; --active-color: #ff914d; --light-bg: #f8f9fa; } * { box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; } body { background-color: #f0f4f8; margin: 0; padding: 20px; color: #333; } .calculator-container { max-width: 500px; margin: 20px auto; background: white; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); overflow: hidden; } .header { background: linear-gradient(135deg, var(--dog-color), var(--cat-color)); color: white; padding: 20px; text-align: center; position: relative; } .logo { position: absolute; top: 10px; left: 10px; width: 40px; height: 40px; background: white; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 18px; } h1 { margin: 0 0 10px 0; font-size: 1.8rem; } .pet-toggle { display: flex; margin: 15px auto; width: 90%; border-radius: 30px; overflow: hidden; border: 2px solid #ddd; } .pet-btn { flex: 1; padding: 12px; border: none; background: transparent; font-weight: bold; cursor: pointer; transition: all 0.3s; outline: none; display: flex; align-items: center; justify-content: center; gap: 8px; } #dogBtn { color: var(--dog-color); } #catBtn { color: var(--cat-color); } .pet-btn.active { background: var(--active-color); color: white; } .pet-icon { font-size: 18px; } .calculator-body { padding: 20px; } .pet-form { display: none; } .pet-form.active { display: block; animation: fadeIn 0.5s; } .form-group { margin-bottom: 15px; } label { display: block; margin-bottom: 5px; font-weight: 600; } input, select { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 6px; font-size: 16px; } button { width: 100%; padding: 14px; background: var(--active-color); color: white; border: none; border-radius: 6px; font-size: 16px; font-weight: bold; cursor: pointer; margin-top: 10px; transition: transform 0.2s; } button:hover { transform: translateY(-2px); } .result { background: var(--light-bg); border-radius: 6px; padding: 15px; margin-top: 20px; display: none; } .result h3 { margin-top: 0; color: var(--active-color); } .age-result { font-size: 1.5rem; font-weight: bold; margin: 10px 0; } .dog-age { color: var(--dog-color); } .cat-age { color: var(--cat-color); } .life-stage { display: inline-block; background: #28a745; color: white; padding: 4px 10px; border-radius: 20px; font-size: 0.9rem; margin: 5px 0; } @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } } // Toggle between dog and cat forms document.getElementById('dogBtn').addEventListener('click', function() { this.classList.add('active'); document.getElementById('catBtn').classList.remove('active'); document.getElementById('dogForm').classList.add('active'); document.getElementById('catForm').classList.remove('active'); document.getElementById('result').style.display = 'none'; }); document.getElementById('catBtn').addEventListener('click', function() { this.classList.add('active'); document.getElementById('dogBtn').classList.remove('active'); document.getElementById('catForm').classList.add('active'); document.getElementById('dogForm').classList.remove('active'); document.getElementById('result').style.display = 'none'; }); function calculateAge() { const isDog = document.getElementById('dogBtn').classList.contains('active'); const resultDiv = document.getElementById('result'); if (isDog) { calculateDogAge(); } else { calculateCatAge(); } resultDiv.style.display = 'block'; resultDiv.scrollIntoView({ behavior: 'smooth' }); } function calculateDogAge() { const age = parseFloat(document.getElementById('dogAge').value); const size = document.getElementById('dogSize').value; if (isNaN(age) || age <= 0) { alert('Please enter a valid age for your dog'); return; } // Dog age calculation let humanAge; if (age <= 2) { humanAge = age * (size === 'small' ? 12.5 : size === 'medium' ? 10.5 : size === 'large' ? 9 : 8); } else { const base = size === 'small' ? 25 : size === 'medium' ? 21 : size === 'large' ? 18 : 16; const rate = size === 'small' ? 4 : size === 'medium' ? 5 : size === 'large' ? 6 : 8; humanAge = base + (age - 2) * rate; } // Life stage let lifeStage; if (age < 1) lifeStage = "Puppy"; else if ( (size === 'small' && age < 7) || (size === 'medium' && age < 7) || (size === 'large' && age < 6) || (size === 'giant' && age < 5) ) lifeStage = "Adult"; else if ( (size === 'small' && age < 12) || (size === 'medium' && age < 12) || (size === 'large' && age < 10) || (size === 'giant' && age < 8) ) lifeStage = "Senior"; else lifeStage = "Geriatric"; displayResult(Math.round(humanAge), lifeStage, 'dog'); } function calculateCatAge() { const age = parseFloat(document.getElementById('catAge').value); const type = document.getElementById('catType').value; if (isNaN(age) || age <= 0) { alert('Please enter a valid age for your cat'); return; } // Cat age calculation let humanAge; if (age <= 1) humanAge = 15; else if (age <= 2) humanAge = 24; else humanAge = 24 + (age - 2) * (type === 'indoor' ? 4 : 5); // Life stage let lifeStage; if (age < 1) lifeStage = "Kitten"; else if (age < 7) lifeStage = "Adult"; else if (age < 12) lifeStage = "Mature"; else lifeStage = "Senior"; displayResult(Math.round(humanAge), lifeStage, 'cat'); } function displayResult(humanAge, lifeStage, petType) { document.getElementById('ageResult').textContent = `${humanAge} human years`; document.getElementById('ageResult').className = `age-result ${petType}-age`; document.getElementById('lifeStage').textContent = lifeStage; let comparison; if (humanAge < 15) comparison = "That's younger than a human teenager!"; else if (humanAge < 25) comparison = "Similar to a young adult human"; else if (humanAge < 50) comparison = "Middle-aged in human terms"; else comparison = "Golden years for humans"; document.getElementById('comparison').textContent = comparison; }

The Most Accurate Pet Age Calculator for Dogs and Cats

Why Pet Owners Love Our Dog and Cat Age Converter

If you've ever searched for a dog age calculator or cat age chart, you know most tools oversimplify pet aging. Our pet age calculator uses veterinary science to give precise conversions from dog years to human years and cat years to human years. Whether you have a puppy, kitten, senior dog, or mature cat, this tool helps you:

• Track pet life stages
• Plan age-specific care
• Compare multi-pet ages
• Understand breed differences

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How Pet Aging Really Works

The Truth About Dog Years and Cat Years

That old "multiply by 7" rule? Totally wrong. Here's what actually matters:

For Dogs:

• Small breeds (under 20 lbs) age slower
• Giant breeds (over 100 lbs) age fastest
• First 2 years equal 24+ human years

For Cats:

• Indoor cats live longer than outdoor cats
• A 1-year-old cat = 15 human years
• Senior cats need special vet care

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How to Use Our Pet Age Tool

Step 1: Choose Your Pet Type

Switch between:

• Dog age calculator (all sizes)
• Cat age converter (indoor/outdoor)

Step 2: Enter Your Pet's Details

Dog Owners Need:

• Exact age (even puppies at 0.5 years)
• Size: toy, small, medium, large, or giant

Cat Owners Need:

• Current age
• Lifestyle: strictly indoor or goes outside

Step 3: Get Human Age Results

See:

• Equivalent human age
• Life stage (kitten/puppy → adult → senior)
• Health tips for that age

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Why Breed Size Matters for Dogs

Small Dogs vs. Giant Dogs: Huge Lifespan Differences

• Chihuahuas (toy breed): Often live 15-20 years
• Great Danes (giant breed): Typically 7-10 years
• Medium dogs like Beagles: 12-15 years

Our dog aging chart adjusts for these differences automatically.

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Cat Age Secrets Most Owners Miss

Indoor Cats Live Longer – Here's Proof

• Indoor cats: Average 13-17 years
• Outdoor cats: Often only 5-10 years
• 2-year-old cat = 24 human years (like a young adult)

Use our cat age calculator to see how environment affects aging.

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Common Pet Age Questions Answered

"Is My 10-Year-Old Dog Old?"

Depends on size!

• Small dog: Like a 56-year-old human
• Big dog: Like a 78-year-old human

"Why Do Cats Age So Fast at First?"

Kittens reach sexual maturity by 6 months – that's why 1 cat year = 15 human years early on.

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Try Our Free Calculator Now

Click above to:

• Calculate dog or cat age in human years
• Get personalized care tips
• Share results with your veterinarian