🎂 Human age
Convert your dog, cat or bird's age into human years based on species and size, and see which life stage it's in.
For: Dog, Cat, Bird
This tool is coming very soon.
How to use it
- Choose your pet's species and fill in the details it asks for.
- See the result and save or share the image with your family.
- Come back anytime: your data stays saved on your phone.
This tool is for guidance only. If you have any concern about your pet's health, ask your vet.
Guide: how to work out your pet's age in human years
What this calculator does
The human age calculator converts your dog, cat or bird's real age into an equivalent age in human years. That helps you understand what stage of life it's in: a puppy full of energy, an adult in its prime, or a senior that needs extra care.
It's useful for practical decisions, like when to switch to a senior food, how often to schedule checkups or what kind of exercise suits it best.
How it works
Pick the species and, for dogs, the size: small, medium, large or giant. Then enter its age in years and months. The tool applies a different formula for each case and shows its human age and life stage.
Size matters a lot in dogs. A 10-year-old Chihuahua and a 10-year-old Great Dane are not the same biological age: large and giant dogs age faster and usually live shorter lives than small ones.
Why it isn't just times seven
The "one dog year equals seven human years" rule is a myth. Dogs and cats mature very quickly at first: by their first birthday they're like a teenager or young adult, and at two they're roughly 24 in human years. After that they age more slowly, around four to seven human years per year depending on size.
Cats follow a pattern similar to small dogs: the first year equals about 15 human years, the second about 24, and then roughly four per year. A 12-year-old cat is already a senior of about 64 in human years.
For birds, it all depends on the species. A budgie lives 5 to 10 years, a cockatoo can pass 40 and some large parrots live over 50. That's why the tool uses each bird type's life expectancy to estimate its stage.
For the full explanation, read our article How old is my dog in human years?
What to do with the result
- Puppy or young: complete vaccines, socialization and training. See puppy school.
- Adult: yearly checkup, a healthy weight and plenty of exercise. Use the ideal weight tool.
- Senior: checkups every six months, adapted food and attention to changes in how it walks, drinks or urinates.
Frequently asked questions
At what age is a dog considered senior?
It depends on size. Giant dogs may be seniors from about 6, while small dogs usually reach that stage around 9 or 10.
And a cat?
Generally from 10 or 11, although many cats live healthy lives to 15 or beyond.
Is the result exact?
No. It's an estimate based on averages. Genetics, diet and care mean every pet ages at its own pace.
Does it work for mixed-breed dogs?
Yes. Choose the size it will be as an adult, or the one closest to its current weight if it's already grown.
Was it helpful? Tell us
Share your opinion, an idea or a bug you spotted. Your message reaches us by email and is not published on the site.