Cat Age Calculator: Cat Years to Human Years
Quick answer: A widely used educational rule of thumb is that a 1-year-old cat ≈ 15 human years, a 2-year-old ≈ 24, and each year after that adds about 4 human years. So a 5-year-old cat is roughly 36 in human years (24 + 3×4). Enter your cat’s age below for an approximate estimate.
Calculator
How we calculate (approximate)
We follow a common public educational pattern:
- Year 1 → about 15 human years
- Year 2 → about 24 human years
- Each year after 2 → about +4 human years
Ages between whole years are interpolated. Indoor/outdoor lifestyle, breed, and health still matter—this is not a medical assessment.
Cat years to human years chart
| Cat age (years) | ≈ Human years |
|---|
FAQ
How old is a 1-year-old cat in human years?
About 15 human years under the common educational rule used on this page.
How old is a 10-year-old cat in human years?
About 56 human years (24 + 8×4). Always approximate.
Do cats age like dogs?
Both often map year 1 ≈ 15 and year 2 ≈ 24 in popular charts, but after that dogs diverge by size while cats commonly add ~4 per year. See our dog calculator for size-based dog estimates.
Is this veterinary advice?
No. Educational estimate only—not a diagnosis or lifespan prediction.