Cat Age Calculator
Year 1 ≈ 15, year 2 ≈ +9, then +4 per year. Click any i for detail.
Cat
Calendar age (years)
i
Age
Decimal years are OK (2.5). |
|---|
How to use this calculator
- Enter the cat's calendar age in years (decimals OK).
- Read the human-year sketch.
- Compare to the dog-age page if you have both pets.
- Remember this ignores breed and indoor/outdoor lifestyle.
Results explained
Year 1 maps to about 15 human years, year 2 adds about 9, then +4 per year after. The ×7 myth is not used.
Quick reference: cat years
A 5-year-old cat is 24 + 3×4 = 36 in this sketch.
| Item | Detail |
|---|---|
| Year 1 | ≈ 15 human years |
| Year 2 | ≈ 24 human years total |
| Each year after 2 | +4 human years |
| Kitten months | decimals OK (0.5 ≈ halfway to year 1 curve) |
AAFP-style classroom curve, not a veterinary diagnostic clock.
How the estimate is built
age≤1: 15y; age≤2: 15+9×(age−1); else 24+4×(age−2).
Example scenario
5-year cat → 36 human-year sketch.
FAQ
Why not just multiply by 7?
Cats mature quickly in year one; ×7 misses that early burst.
Do indoor cats live longer?
Lifestyle affects real lifespan; this page does not adjust for it.
Is this the same as dog years?
No. Dogs use a different piecewise curve on the dog-age page.