Cat Age Calculator
Convert your cat's age to human years using the standard 15-24-then-4 table and see its life stage. Free, instant and private in your browser.
๐ Runs entirely in your browser โ nothing is uploadedHow cat years become human years
Cats grow up fast. By its first birthday a cat is roughly as mature as a 15-year-old person, and by two it matches a 24-year-old. After that the pace settles down to about four human years for every cat year. This is the table used by the American Association of Feline Practitioners and most veterinary clinics, and it is exactly what this calculator applies. Months are counted too, so a 6-month-old kitten comes out at about 7.5 human years.
A quick reference
A 3-year-old cat is about 28 in human years, a 5-year-old about 36, a 10-year-old about 56, a 15-year-old about 76 and a 20-year-old about 96. Because the formula is linear after the second birthday, you can also work it out yourself: take 24 and add four times the number of years beyond two.
Life stages and care
The tool also shows the life stage: kitten under one year, adult until about 7, mature from 7, and senior from 10. Older cats are prone to kidney disease, thyroid problems, dental disease and arthritis, so regular check-ups, a good diet, fresh water and easy access to litter boxes and resting spots all help them stay comfortable.
Individual cats vary with genetics, lifestyle and health, so treat the result as a guide. Everything is calculated locally in your browser and nothing is uploaded.
How to use
- Enter your cat's ageType the age in years and extra months, for example 7 years and 3 months.
- Read the human ageThe result updates instantly and shows the equivalent age in human years.
- Check the life stageSee whether your cat counts as a kitten, adult, mature adult or senior.