Convert your cat’s age into human years using a standard veterinary approximation.
The Cat Age Calculator converts your cat’s age into the equivalent human age, using a commonly cited veterinary approximation.
Like dogs, cats mature quickly in their first two years and then age more gradually. This is an approximation for general interest, not a veterinary assessment.
Year 1 = 15 human years. Year 2 adds 9 more (total 24 by age 2). Each year after that adds about 4 human years.
A 4-year-old cat is about 24 + (2 × 4) = 32 in human years.
A common approximation is that a cat's first year equals about 15 human years, the second year adds about 9 more, and each year after adds about 4 human years.
No — it's a widely used approximation. Actual aging depends on breed, size, and health, but the formula gives a reasonable general comparison.
Indoor cats often live longer on average due to reduced exposure to accidents, predators, and disease, though the age-conversion formula itself doesn't distinguish between the two.