About PetYearsCalc

PetYearsCalc is a small, independent website with one simple goal: to answer "how old is my pet in human years?" better than the old ×7 rule.

What we do

We build free, fast, mobile-friendly calculators for dog, cat, rabbit, ferret, chinchilla, hedgehog, horse, bearded dragon, leopard gecko, ball python, corn snake, axolotl, tortoise, turtle, parakeet, budgie, cockatiel and parrot owners — for puppies and kittens, specific breeds, small dogs, senior cats, Siamese, Maine Coon and Ragdoll cats (lifespan, growth chart and age in human years for both Maine Coons and Ragdolls), rabbits, ferrets, chinchilla lifespan and age, pet and wild hedgehog lifespan, hedgehog hibernation and hedgehog life stages, pet rat lifespan, rat age in human years, rat size by age, wild rat species, mouse lifespan and how long rats and mice survive without food or water, horses and ponies, bearded dragon size, age and feeding, leopard gecko lifespan and size by age, axolotl lifespan, size by age and life cycle, ball python (royal python) size by age and feeding, corn snake size, lifespan, feeding and morphs, tortoise and turtle lifespans, parakeet, budgie and parrot lifespans by species, how to tell a budgie's age, and even estimating age from teeth. Every tool runs in your browser, so your pet's details never leave your device. We also make fruit fly, gnat and flightless fruit fly culture calculators — including fruit fly egg, larvae and pupa timers and a berry salt water test — plus mosquito, crane fly, house fly and cluster fly calculators, for curious homeowners and for keepers who raise feeder insects.

Our sources

Our numbers come from published veterinary references, including the American Kennel Club (AKC) and American Veterinary Medical Association (AVMA) size-based dog age charts, the 2019 AAHA Canine Life Stage Guidelines, the 2021 AAHA/AAFP Feline Life Stage Guidelines, the 2020 UC San Diego DNA-methylation study, for Maine Coons, the Royal Veterinary College's VetCompass cat life tables, the Cornell Feline Health Center, International Cat Care, TICA, the CFA and peer-reviewed studies of heart disease, hip dysplasia and kitten growth, for Ragdolls, the VetCompass Ragdoll study of 21,358 UK cats, the CFA, the British Ragdoll Cat Club and peer-reviewed studies of the breed's MYBPC3 heart variant, rabbit-welfare organisations such as the RWAF, for ferrets, the Merck Veterinary Manual, VCA Animal Hospitals, PDSA and the RSPCA, for chinchillas, the Merck Veterinary Manual, VCA, PetMD, the RSPCA, the Animal Diversity Web, the IUCN Red List and Guinness World Records, for hedgehogs, the Merck Veterinary Manual, VCA, the Royal Veterinary College, the University of Florida, the British Hedgehog Preservation Society, the People's Trust for Endangered Species, Hedgehog Street and peer-reviewed hedgehog research, for rats and mice, the Merck Veterinary Manual, PetMD, the RSPCA, the National Fancy Rat Society, the AFRMA, University of California IPM, the Internet Center for Wildlife Damage Management, the Animal Diversity Web, the AnAge database, The Jackson Laboratory and peer-reviewed studies of rat ageing, growth and fasting, for horses, the American Association of Equine Practitioners (AAEP) aging guide and university extension services, for bearded dragons, NC State Veterinary Hospital, VCA Animal Hospitals, PetMD and the RSPCA, for ball pythons, Arbor View Animal Hospital, VetFolio, VCA, PetMD and the Animal Diversity Web, for corn snakes, the Merck Veterinary Manual, the Royal Veterinary College, the RSPCA, PetMD, LafeberVet, Smithsonian's National Zoo, the Animal Diversity Web, the Virginia Herpetological Society and Ian's Vivarium morph guide, for leopard geckos, PetMD, VCA, Arbor View Animal Hospital, LafeberVet and the Animal Diversity Web, for axolotls, VCA, PetMD, LafeberVet, the Ambystoma Genetic Stock Center (University of Kentucky), UNSW Embryology, the Animal Diversity Web, the IUCN Red List and peer-reviewed axolotl research, for parakeets, budgies and parrots, the Merck Veterinary Manual, VCA Animal Hospitals, PetMD, the AnAge database, a 2012 study of 83,000 zoo parrot records (Young et al.), the World Parrot Trust, the Animal Diversity Web and Guinness World Records, and, for tortoises and turtles, PetMD, the IUCN Tortoise and Freshwater Turtle Specialist Group, zoos such as the Smithsonian's National Zoo and San Diego Zoo, and published growth studies. Each calculator lists its sources at the bottom of the page.

Important note

Human-year conversions are estimates meant for education and fun. Every animal ages differently. For health questions, please talk to your veterinarian.

Get in touch

Found a mistake or want a new calculator? Contact us — we read every message.