MyAgeCalc

Cat age calculator

How old is your cat in human years? Move the slider — or drag the curve below.

In human yearsYoung adult
40

A 6-year-old cat is roughly like a 40-year-old person — life stage: young adult.

Why cats “age” fastest at the start

A kitten goes from newborn to sexually mature in under a year — the same journey takes a person about fifteen. By two, a cat is the equivalent of a 24-year-old adult.

After that the pace settles to roughly four human years per cat year, which is why the curve bends and then runs almost straight.

KittenYoung adultMature adultSenior025101520

Cat's age (drag) → human years. The steep start is the first two years: 15, then +9.

Cat years chart

  1. 1 yr15
  2. 2 yr24
  3. 3 yr28
  4. 4 yr32
  5. 5 yr36
  6. 6 yr40
  7. 7 yr44
  8. 8 yr48
  9. 9 yr52
  10. 10 yr56
  11. 11 yr60
  12. 12 yr64
  13. 13 yr68
  14. 14 yr72
  15. 15 yr76
  16. 16 yr80
  17. 17 yr84
  18. 18 yr88
  19. 19 yr92
  20. 20 yr96
  21. 21 yr100
  22. 22 yr104

Questions

How do you convert cat years to human years?

The first year of a cat's life equals about 15 human years, the second adds about 9 more (24 in total), and every year after that adds about 4. So a 10-year-old cat is roughly 56 in human years.

How old is a 1-year-old cat in human years?

About 15 — a cat is sexually mature and nearly full-grown by its first birthday.

At what age is a cat a senior?

Vets usually class cats as mature from 7 to 10 and senior from about 11. Many indoor cats live into their late teens or early twenties.

Do indoor and outdoor cats age differently?

Their bodies age at the same rate, but indoor cats tend to live longer because they face fewer accidents, fights and infections.

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