How do I calculate my cat's age in human years?

Cats age rapidly in their first two years: the first year equals 15 human years, the second adds 9 more (24 total). Each subsequent cat year equals about 4 human years. A 10-year-old cat is approximately 56 in human years.

Cat Age Calculator

Convert your cat's age to human years using AAHA/AVMA veterinary guidelines. Understand your cat's life stage and what care they need at every age.

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Cat Age to Human Years — Quick Reference

Cat Age	Human Years	Life Stage
6 months	10	Kitten
1 year	15	Junior
2 years	24	Young Adult
3 years	28	Adult
5 years	36	Adult
7 years	44	Mature
10 years	56	Senior
13 years	68	Senior
15 years	76	Geriatric
18 years	88	Geriatric
20 years	96	Geriatric

Frequently Asked Questions

Indoor cats typically live 12-18 years, while outdoor cats average only 2-5 years due to risks like traffic, predators, disease, and accidents. Our calculator provides a baseline — indoor cats may live longer and healthier lives with proper care.

Veterinarians typically classify cats as "senior" at 10-11 years and "geriatric" at 15+. However, many cats remain active and healthy well into their senior years. The AAFP (American Association of Feline Practitioners) recommends bi-annual checkups starting at age 10 to catch age-related conditions early.

Common age-related conditions in cats include: chronic kidney disease (affects 30-50% of cats over 15), hyperthyroidism, dental disease, arthritis, and cognitive dysfunction. Annual blood panels become essential for senior cats to catch these conditions in treatable stages.