Cat age calculator
A cat is a near-adult at one, a young adult at two, and then ages at a steady four human years per year. That is the chart vets quote — here it is as a calculator and a table.
🐱 Cat age calculator
The standard veterinary chart: year 1 ≈ 15 human years, year 2 adds 9 (total 24), then +4 for every year after — the chart published with the 2021 AAHA/AAFP Feline Life Stage Guidelines.
In human years
36 yrs
Life stage: Young adult
Life stages follow AAHA/AAFP: kitten under 1, young adult 1-6, mature adult 7-10, senior over 10. Indoor cats often live well into their late teens — a 15-year-old cat is about 76 in human years on this chart, not 105 as the old ×7 myth would claim.
Cat years chart
| Cat age | Human years |
|---|---|
| 1 yr | 15 |
| 2 yr | 24 |
| 3 yr | 28 |
| 5 yr | 36 |
| 7 yr | 44 |
| 10 yr | 56 |
| 12 yr | 64 |
| 15 yr | 76 |
| 18 yr | 88 |
| 20 yr | 96 |
Chart published with the 2021 AAHA/AAFP Feline Life Stage Guidelines. Worked example: a 10-year-old cat = 24 + (8 × 4) = 56 human years, at the start of the senior stage. See also the feeding calculator — senior cats often need calorie and protein conversations with a vet.