Dog & Cat Age Calculator — what it does, the basis for its calculations, and why we made it.
The Pet Age Calculator is a free web tool that converts the ages of dogs and cats into human years. Just enter your pet's age — and, for dogs, their size.
The conversion follows guidance from the American Veterinary Medical Association (AVMA), the size-based conversion chart published in veterinary references, and the American Animal Hospital Association (AAHA) feline life stage standards. Instead of the simple 'pet age × 7' rule, it reflects the real aging curve: fast in the early years, then gradually slower.
Knowing your pet's age in human terms makes it easier to adjust food, health checkups, and exercise to their life stage. This site exists to help owners understand where their companion stands in life.
Aging speed varies by breed, build, and health. Results are for reference only — for health care decisions, consult your veterinarian.