Pet Age Calculator
Convert your dog or cat's age into human years
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
This tool converts your dog's or cat's age into the equivalent human age. It accounts for the fact that larger dog breeds age faster than smaller ones, giving you a more realistic estimate than a simple multiplier. Everything runs directly in your browser, so no data ever leaves your device.
How to use
- Choose the pet type — dog or cat.
- Enter your pet's actual age in years.
- If you selected a dog, also choose its size (small, medium, or large).
- The human-equivalent age appears instantly at the top.
FAQ
- Do dogs and cats age at the same rate?
- Up to two years old, the calculation is the same for both. After that, cats and small dogs gain about 4 human years per year, medium dogs about 5, and large dogs about 6.
- Why does dog size matter?
- Larger dog breeds tend to age faster than smaller ones, so selecting the correct size gives a more accurate human-age estimate.
- Can I calculate the age of a pet younger than one year?
- Yes. For pets under one year old, the age is scaled at a rate of 15 human years per pet year.