How cat years convert
The common conversion: the first year of a cat's life counts as about 15 human years. The second year adds about 9 (so a 2-year-old is around 24), and every year after that counts as roughly 4. A 10-year-old cat is therefore about 56.
It's an approximation. Cats mature quickly in the first two years, then age more slowly, and the 'times seven' shortcut people use for dogs and cats gets this badly wrong for young animals. A one-year-old cat is closer to a teenager than a seven-year-old child.
Life stages matter more than the number
Vets think in life stages, because that's what changes the care. We use the AAFP and AAHA feline life stage categories (2010):
| Stage | Age |
|---|---|
| Kitten | Birth to 6 months |
| Junior | 7 months to 2 years |
| Prime | 3 to 6 years |
| Mature | 7 to 10 years |
| Senior | 11 to 14 years |
| Geriatric | 15 years and over |
From around 7 years, yearly checks, bloodwork and weight tracking pay off, and many vets suggest twice-yearly checks from about 11. Weight loss in an older cat is a reason to call the vet and not wait for the next appointment.
Why a puppy site has a cat calculator
Plenty of households have both, and people searching for one often need the other. The cat tool is a small free extra. The main job of PupCurve is puppy growth.
How to use it, step by step
- Enter years and months. Use your cat's real age, or the vet's estimate for a rescue.
- Read the human age. 15 for the first year, 24 at two, then 4 more per year.
- Check the life stage. It tells you what check-ups and care fit your cat's age.
Questions people ask
How old is a 1-year-old cat in human years?
About 15. A 2-year-old cat is about 24, and each year after that adds roughly 4.
How old is a 10-year-old cat in human years?
Around 56 with this conversion: 24 at age 2, plus 8 more years at 4 each.
When is a cat considered a senior?
The AAFP and AAHA life stage guidelines call cats senior from 11 years, mature from 7, and geriatric from 15.
Is the cat-years-times-seven rule right?
No. It overstates the age of young cats and understates how quickly they mature in the first two years.
Last reviewed October 31, 2026. General information, not veterinary advice. Growth curves are PupCurve's analysis of data from Salt et al. 2017 (CC BY 4.0). How it works.