Cat Age Calculator

Convert cat years to human years accurately. Understand your cat's life stage and get age-appropriate care recommendations.

Your cat's age in years (can use decimals for months)

Affects life expectancy, not age calculation

Veterinary Formula (All Cats):\nYear 1 = 15 human years\nYear 2 = 9 human years\nYear 3+ = 4 human years each\n\nUnlike dogs, all cats age at the same rate regardless of size or breed.
Example 1 (Young Cat):\nCat Age: 3 years\n\nHuman Age = 15 + 9 + (1 × 4) = 28 years\nLife Stage: Prime (Young Adult)\n\nExample 2 (Senior Cat):\nCat Age: 12 years\n\nHuman Age = 15 + 9 + (10 × 4) = 64 years\nLife Stage: Senior (Elderly)\n\nExample 3 (Kitten):\nCat Age: 0.5 years (6 months)\n\nHuman Age = 0.5 × 15 = 7.5 years\nLife Stage: Kitten (Infant)

How do you calculate cat years to human years?

First year = 15 human years, second year = 9 human years (total 24), then each year after = 4 human years. This is more accurate than the old "1 cat year = 7 human years" myth. A 10-year-old cat is about 56 in human years.

Do indoor and outdoor cats age differently?

Indoor cats typically live longer (12-18 years) due to fewer risks (traffic, predators, disease). Outdoor cats average 2-5 years due to hazards. Both age at the same rate biologically, but outdoor cats face more health challenges that can shorten lifespan.

At what age is a cat considered senior?

Cats are considered senior at 11-14 years (equivalent to 60-72 human years) and geriatric at 15+ years (76+ human years). Unlike dogs, cat aging doesn't vary significantly by breed or size - all cats age at roughly the same rate.

How long do cats typically live?

Indoor cats: 12-18 years (some reach 20+). Outdoor cats: 2-5 years. Mixed (indoor/outdoor): 8-10 years. Record: Oldest verified cat lived to 38 years. Breed differences are minimal compared to dogs - size doesn't affect cat lifespan like it does for dogs.

What are the life stages of a cat?

Kitten (0-6 months): rapid growth. Junior (7 months-2 years): adolescence. Prime (3-6 years): peak health. Mature (7-10 years): middle age. Senior (11-14 years): elderly. Geriatric (15+ years): very elderly. Each stage has different care needs.