Ever wonder how old your cat really is in human years? Cats age much faster than we do—especially in their early years—so a one-year-old kitten is already the equivalent of a teenager! Our Cat Years to Human Years Calculator makes it easy to convert your cat’s age with just a few clicks.
How are cat years calculated? The first year of a cat’s life is roughly equal to 15 human years. The second year adds about 9 more. After that, each additional cat year is approximately 4 human years.
Why do cats age faster? Cats mature quickly in their first two years, reaching full adulthood far sooner than humans. This rapid early development is why those first few cat years account for such big jumps in “human age” comparisons.