Pawaide Pet Calculator
Cat Age Calculator
Convert your cat's age into human years and discover your cat's true life stage.
You can use decimals — e.g. 0.5 for 6 months.
Quick answer
A cat's first year equals about 15 human years, the second year brings them to about 24, and every year after adds roughly 4 human years.
How cat years work
Cats age rapidly in their first two years. A 1-year-old cat is about 15 in human years, and a 2-year-old is roughly 24. After that, each additional cat year is about 4 human years.
Knowing your cat's human-equivalent age helps you anticipate diet changes, vet checkups and senior care.
Good to know
Frequently asked questions
How old is my cat in human years?
A cat's first year equals about 15 human years, the second year brings them to about 24, and every year after adds roughly 4 human years.
When is a cat considered senior?
Cats are generally considered mature at 7–10 years and senior at 11+. Many cats live well into their late teens with good care.
Do indoor cats age differently?
The aging formula is the same, but indoor cats often live longer due to fewer hazards, so they may stay healthier at older human-equivalent ages.
Methodology
Sources & references
More pet calculators
These calculators provide general estimates for educational purposes and are not a substitute for professional veterinary advice.