buncha/health & fitness/pet-age

Pet Age Calculator

Stays on this device. Translate your pet's age to "human years" using the formulas vets actually use, not the old "multiply by 7" rule (which is wildly off — pets age fast as kittens and puppies, then much slower).

Species

Years

Months

Size band

Big dogs age faster in the back half of life; toy breeds age slower. Pick the closest band.

Human-equivalent age

49 years

Life stage: Adult · Dog aged 3y 0m

Quick reference

1-year-old dog31 human years

2-year-old dog42 human years

5-year-old dog57 human years

8-year-old dog64 human years

12-year-old dog71 human years

16-year-old dog75 human years

How the math works. For cats, the AAHA / Cornell ladder: year 1 ≈ 15 human years, year 2 adds 9, then +4 per year after. For dogs, we use the 2019 UC San Diego epigenetic-clock formula human ≈ 16 × ln(years) + 31 with a small size adjustment in the back half of life (giant breeds age faster, toy breeds slower). It's a heuristic, not a vet exam — useful for context, not for medical decisions.

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About Pet Age Calculator

How old is your dog or cat in human years? Uses the formulas vets actually use — AAHA cat ladder + the 2019 epigenetic-clock dog model — not the old 'multiply by 7' rule. Includes life stage, size-banded dog math, and a quick-reference table.

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