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Cat Age Calculator | Human Years Conversion

Convert your cat's age to human years accurately using the veterinary-approved "15-9-4" rule.

Years

*Calculations based on AAHA/AAFP Feline Life Stage Guidelines.

Your cat is approximately

-- years

in human years

--

Enter age to see result

Go Deeper

Your cat isn't average. Why settle for an average answer?

The calculator above treats every cat the same. But neutering, lifestyle, breed, and body condition can shift your cat's real biological age by years in either direction.

+62%
lifespan for neutered males
2.8×
mortality risk if obese
+1.5y
mixed-breed advantage
Try the Advanced Calculator

Free. No sign-up. Available in 10+ languages.

The advanced version factors in
  • Gender & neuter status
  • Indoor / outdoor lifestyle
  • Mixed-breed vs. purebred
  • Body condition score
  • Life-stage care recommendations

Why "7 Years" Is a Myth

You've likely heard that one cat year equals seven human years. While simple, this rule is scientifically inaccurate. Cats don't age linearly; they mature incredibly fast in their first two years.

The Veterinary "15-9-4" Rule

  • 1 First Year: Equals 15 human years.
  • 2 Second Year: Adds 9 years (Total 24).
  • 3+ Thereafter: Each year adds 4 human years.

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