Cat Age Calculator

This calculator converts a cat's age into human years and back again. Enter the age in years and months and it returns the human equivalent from the International Cat Care chart, which counts the first cat year as 15 human years, the second as 9 more, and every year after that as 4. It also names the life stage from the 2021 AAHA/AAFP Feline Life Stage Guidelines, whose four bands are kitten, young adult, mature adult and senior. The cat chart has no size bands, which is the main way it differs from the dog version, where a giant breed ages faster than a small one. It is a rough life stage comparison and not a prediction of how long any particular cat will live.