Pets age faster than people do, especially in their first two years. This calculator gives a rough human-years comparison and life stage. It is based on the general age charts many vets use. It isn't an exact science: breed, size, genetics, and health all matter.
How we estimate it
- Cats: about 15 human years at age 1 and about 24 at age 2. After that, add about 4 years for each cat year. Life stages follow the AAHA/AAFP Feline Life Stage Guidelines: kitten (under 1), young adult (1–6), mature adult (7–10), senior (over 10).
- Dogs: about 15 human years at age 1 and about 24 at age 2. After that, add about 4 (small), 5 (medium), 6 (large), or 7 (giant) years for each dog year, because larger dogs tend to age faster. Senior ages are rough guides that vary by breed.
Not veterinary advice. These free tools and guides are for general education only. They can't diagnose, treat, or replace a visit with a licensed veterinarian. Every pet is different, so always ask your vet about your own pet's diet, health, and care.