About Cats Age Calculator
Cats Age Calculator is a free, ad-supported tool that converts your cat's age into human years. We built it because most "cat years" rules of thumb you hear (like "multiply by 7") are wrong, and cats don't actually age that way. Vets use a different formula, and we wanted a clear, friendly tool that uses the right one.
The Formula We Use
Our calculator follows the American Animal Hospital Association (AAHA) feline life-stage guidelines:
- The first year of a cat's life is roughly equivalent to 15 human years.
- The second year adds another 9 human years (so a 2-year-old cat is about 24 in human years).
- Each year after that adds approximately 4 human years.
We also map every age to a life stage (Kitten, Junior, Adult, Mature, Senior, or Geriatric) so you know what kind of care your cat needs at each phase.
Our Editorial & Sourcing Standards
Every guide on Cats Age Calculator is researched against established veterinary references, including the American Animal Hospital Association (AAHA) and American Association of Feline Practitioners (AAFP) feline life-stage guidelines and the Cornell Feline Health Center. Our calculator uses the AAHA feline life-stage formula, the same standard veterinarians use, not the outdated “multiply by seven” rule of thumb.
We write in plain English, link to the relevant tool or guide where it helps, and list our sources at the end of every article. When the underlying guidelines change or we find a better source, we revise the affected page and update its “last updated” date.
Cats Age Calculator is published independently by Lonesmith. We are not a veterinary practice, and our content is for general educational purposes only; it is not a substitute for professional diagnosis or treatment. For any concern about your cat’s health, please talk to your veterinarian.
How We Make Money
We keep the tool free by running display ads (Google AdSense) and earning small affiliate commissions when visitors buy recommended products through our Amazon links. As an Amazon Associate, we earn from qualifying purchases. The product recommendations we feature are categories we'd genuinely use ourselves: kitten food for kittens, dental treats, joint supplements for older cats, and so on. We never get paid to inflate ratings or push specific brands.
Sister Site
If you have a dog too, check out our companion calculator at dogsagecalculator.com. The dog formula is more nuanced because breed and size matter a lot, so it has a slightly different setup.
Contact
Got feedback, a correction, or just want to say hi? Email us at [email protected]. We read everything.
← Back to the Cats Age Calculator
Last updated: