Pet age calculators

Pet age calculators convert calendar years into the equivalent life stage for each species using research-based aging rate models. Dogs age faster than humans and the rate varies significantly by breed size: small breeds age more slowly in middle and later years, while giant breeds age more rapidly and have shorter median lifespans. The dog age calculator uses American Kennel Club size categories to map age to the equivalent human life stage and surfaces health milestones relevant to each stage.

The cat calculator applies the American Association of Feline Practitioners life stage classification — kitten, junior, prime, mature, senior, geriatric — rather than the inaccurate folklore rule of multiplying by seven. Species-specific calculators for rabbits, horses, birds, fish, hamsters, guinea pigs, frogs, turtles, and parakeets use published longevity data for each animal. The universal pet age calculator handles any pet with a custom lifespan input when a dedicated tool is not listed.