Pet Age Calculator
Convert your dog's or cat's age into human years
Enter your dog's or cat's age and see it converted into human years. Because larger breeds age faster, the calculator factors in breed size (small, medium, or large) for a more realistic number — useful for understanding where your pet is in life and for framing questions before a vet visit. Everything is calculated instantly in your browser with nothing sent to a server.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Choose your pet type: dog or cat.
- Enter your pet's actual age in years.
- If you picked dog, also select the breed size: small, medium, or large.
- Read the human-equivalent age displayed at the top.
FAQ
- Are dogs and cats converted differently?
- Yes. The first two years use the same scale for both, but after that cats and small dogs age about 4 human years annually, medium dogs about 5, and large dogs about 6.
- Why do I have to pick a breed size?
- Larger dogs age faster, so they convert to a higher human age at the same chronological age. Selecting the size gives you a more accurate result.
- Can I calculate for a pet under one year old?
- Yes. The first year of life is scaled to roughly 15 human years, so you can look up puppies and kittens too.