How do you calculate a cat's age?

According to Purina, there is no scientific way to specifically calculate a cat's age in human years. However, the steps below provide a general comparison.

1. Start at age 15 if the cat is 1 year old or older

   Purina estimates that a cat's first two years equate roughly to a human's first 25.

2. Add nine years if the cat is 2 years old

   A two-year old cat would be 24 in human years.

3. Add four human years for each year your cat is older than 2

   If a cat is 3 years old, it is 28 in human years. If it is 4 years old, it is 32.