CalKit

Pet Age Calculator

Calculate pet age in human years.

세
사람 나이 환산
청년기
약 36세

강아지 (중형 (10~25kg)) 5세 기준

수명 정보

반려동물 나이5세
사람 나이 환산약 36세
생애 단계청년기
평균 기대수명12세
예상 남은 수명약 7년

나이 환산표

강아지 1세사람 약 11세
강아지 2세사람 약 21세
강아지 3세사람 약 26세
강아지 5세사람 약 36세
강아지 7세사람 약 46세
강아지 10세사람 약 61세
강아지 13세사람 약 76세
강아지 15세사람 약 86세

Overview

The Pet Age Calculator converts your dog's or cat's age into human-equivalent years. Rather than the simplistic '7 times' rule, it uses a scientifically informed formula that accounts for breed size and varying aging rates.

Formula

Dog (small breed): Human Age ≈ 16 × ln(dog age) + 31 (natural log-based formula). Simplified: Year 1 = 15 human years, Year 2 = 24, then +4–5 per year. Large breeds age faster at +5–7 per year.

How to Use

  1. 1Select the pet type (dog or cat).
  2. 2For dogs, select the size category (small / medium / large / giant).
  3. 3Enter the pet's age in years.
  4. 4The human-equivalent age and life stage (puppy / adolescent / adult / senior) are displayed.

Tips

  • ✔The 'multiply by 7' rule is inaccurate because early growth is much faster.
  • ✔Large breeds have shorter lifespans and age faster than small breeds.
  • ✔Indoor cats live an average of 15–20 years, longer than outdoor cats.
  • ✔Once your pet reaches the human-equivalent of 40 (middle age), start regular health checkups.
  • ✔Breed-specific genetics influence lifespan and health risks.

FAQ

Q. How old is a 1-year-old dog in human years?

A 1-year-old dog is roughly equivalent to a 15-year-old human. At 2 years, about 24. After that, add 4–7 years annually depending on breed size.

Q. Why do small and large breeds age differently?

Large breeds grow faster and undergo more cell division, leading to earlier onset of age-related diseases. Small breeds age more slowly and tend to live longer.

Q. Is the cat age calculation the same as for dogs?

Cats use a separate conversion: Year 1 ≈ 15, Year 2 ≈ 24, then about +4 years annually. Size-based variation is less significant in cats than in dogs.

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