How old is your pet in human years?

The first year of a dog's life equals about 15 human years and the second about 9 more (24 total). After that, small dogs add about 4 human years per year, medium dogs about 5, large dogs about 5–6 and giant dogs about 7.

A 1-year-old cat is about 15 in human years and a 2-year-old about 24. After that, add about 4 human years for every year.

No — that's a myth. Dogs mature much faster early on (a 1-year-old dog is like a 15-year-old teen) and then slow down, and big dogs age faster than small ones.

A 1-year-old rabbit is about 20 in human years; after that, each rabbit year adds about 6 human years, so a 5-year-old rabbit is about 44. Try the rabbit age calculator for any age and breed.

There is no veterinary formula, but a published ferret age chart puts a 1-year-old ferret at about 15 in human years, a 4-year-old at about 50 and a 7-year-old at about 80. Pet ferrets typically live 5–10 years. Try the ferret age calculator for any age.

Pet chinchillas typically live 10–20 years (RSPCA; Merck: 10–15 on average, up to 20), far longer than hamsters or guinea pigs, while wild chinchillas live about 6–10 years. A 10-year-old chinchilla is about 56 in human years. See our chinchilla lifespan and age calculator.

A 1-year-old horse is about 6.5 in human years, a 4-year-old about 20.5, and after that each year adds about 2.5 human years, so a 20-year-old horse is about 60.5. Try the horse age calculator, or estimate an unknown age with horse age by teeth.

The simplest published method multiplies by 8, so a 5-year-old bearded dragon is about 40 in human years — an estimate, as no veterinary chart exists. Try the bearded dragon age calculator, or check growth with bearded dragon size by age.

Pet leopard geckos typically live 10–20 years (PetMD; VCA: 10–15), and about 6–8 years in the wild (PetMD). A 5-year-old leopard gecko is about 32.3 in human years and a 10-year-old about 52.7. Try the leopard gecko lifespan and age calculator, or check growth with leopard gecko size by age.

Tortoise lifespans vary so much by species that we scale by lifespan: human years = age × 73.1 ÷ the species' typical lifespan. A 10-year-old sulcata is about 11.2 in human years, but a 10-year-old red-eared slider about 32.5. Try the tortoise age calculator or see how long tortoises live.

Pet axolotls typically live 10–15 years (VCA, San Diego Zoo), while wild ones live around 5 years on average (Connecticut's Beardsley Zoo). A 5-year-old axolotl is about 35.5 in human years. Try the axolotl lifespan and age calculator, check growth with axolotl size by age, or explore the axolotl life cycle.

Pet African pygmy hedgehogs typically live 4–6 years (Merck, VCA), and some reach 8–10. Wild European hedgehogs live about 2 years on average (PTES). See the pet hedgehog lifespan calculator, the wild hedgehog survival explorer, the hibernation checker and the hedgehog age calculator.

Pet corn snakes live 10–15 years on average (Merck Veterinary Manual, RSPCA) and up to 20 or more with good care (PetMD, RVC); wild ones about 6–8 years. A 10-year-old corn snake is about 52.7 in human years. See the corn snake lifespan calculator, how big corn snakes get, the corn snake feeding chart and the corn snake morph explorer.

Yes. Every PetYearsCalc calculator is free, works on any phone or computer, and doesn't need an account.