Cat Age Calculator
Convert your cat's age to human years. Enter your cat's age in cat years to see their equivalent human age and life stage.
Kitten / Junior stage
How to Calculate Cat Years to Human Years
Converting cat years to human years follows a similar pattern to dogs but with different numbers. Cats age rapidly in their first two years and then settle into a steadier aging rate.
The formula: the first year of a cat's life equals 15 human years, the second year adds 9 more human years, and each subsequent year adds 4 human years. An indoor cat typically lives 12-18 years, while outdoor cats have shorter life expectancies.
Our cat age calculator also shows your cat's life stage, helping you understand whether your feline friend is a kitten, young adult, mature adult, senior, or geriatric. This can help guide nutrition, exercise, and veterinary care decisions.
Use the calculator above to convert your cat's age to human years instantly.