What is a pet age calculator?
A pet age calculator converts your dog or cat's age into the equivalent human years. Unlike the popular myth of multiplying by 7, this calculator uses veterinarian-recommended formulas that account for the animal's species and size category.
How to calculate a dog's age in human years?
Dog age is calculated using four size categories: small (under 10 kg), medium (10–25 kg), large (25–45 kg), and giant (over 45 kg). In the first year, dogs mature fastest — equivalent to roughly 12–15 human years. The second year adds another 9 human years. After that, each dog year adds 4–7 human years depending on size.
How to calculate a cat's age in human years?
A cat's first year corresponds to about 15 human years. The second year adds 9 more. After two years, each additional cat year equals approximately 4 human years. So a 5-year-old cat is roughly equivalent to a 36-year-old human.
Pet age calculation examples
A 3-year-old medium dog is approximately 29 in human years. A 5-year-old cat is about 36 human years. An 8-year-old large dog is around 60 human years and is already considered a senior.
What are the pet life stages?
Dog life stages are: puppy (under 1 year), junior (1–2 years), adult (2–6/11 years depending on size), and senior. Cat life stages are: kitten (under 1 year), junior (1–2 years), adult (2–10 years), and senior (10+ years). Larger dogs age faster than smaller ones.
Why does dog size matter for age calculation?
Small breed dogs tend to live longer and age more slowly. A small dog may remain in the adult stage until age 11, while a giant breed dog becomes a senior as early as age 6. Knowing the size category is essential for an accurate conversion to human years.