Cat Age Calculator: Cat Years to Human Years

Physically mature and usually at peak health. An annual wellness exam is the standard recommendation.

1. Count the first year as 15. A one-year-old cat is already fully grown.
2. Add 9 for the second year. That brings a two-year-old cat to 24.
3. Add 4 for every year after. The rate stays flat from there.
4. Read the life stage. Kitten, young adult, mature adult, or senior.
5. Check the chart. The table covers one month through twenty years.

Rescue and stray cats often arrive with no history. Teeth give the closest estimate, and a vet can narrow it further.

Under 6 months

Baby teeth present, then permanent incisors at about 4 months and canines at about 5 months.

6 months to 1 year

A full set of permanent teeth, clean and white. Still filling out in frame and weight.

1 to 2 years

Teeth still white with a faint yellow cast starting on the back molars. Coat is soft and even.

3 to 5 years

Tartar visible on most teeth and some wear on the tips. Body is at full adult muscle.

5 to 10 years

Heavier tartar, gum recession possible, and the iris may start to look slightly less crisp.

10 years and older

Missing or worn teeth, a hazy lens from nuclear sclerosis, a coarser coat, and less muscle over the spine and hips.