Cat & Dog Age Calculators

A 1-year-old dog is about 15 human years and a 2-year-old is about 24, regardless of breed. After year two, size sets the rate: small dogs add about 4 human years per dog year, medium 5, large 6, and giant 7. Use the Dog Age Calculator by Birth Date for an exact date, Months and Weeks for puppies, or Breed if you know the breed name.

About 5 human years - not 2. The first dog year maps to about 15 human years, so four months is roughly one-third of that span. A 3-month-old puppy sits near 4-5 human years and a 6-month-old near 8-10. The month-by-month puppy age chart walks through those checkpoints by size.

No. The AVMA states dogs do not age at 7 human years per dog year. A 1-year-old dog is about 15 human years, not 7, and a 10-year-old Chihuahua is about 56, not 70. The flat 7x shortcut is closest for medium dogs around age 5 and wrong at every other age.

Use the Cat Age Calculator by Birth Date if you know the birth date, or the Cat Age Calculator by Months and Weeks if you only know age in weeks or months. Both apply the standard veterinary curve: about 15 human years in year one, 24 by year two, then roughly +4 per cat year after that.

Yes. Indoor cats typically live 14-20 years, while outdoor cats average 5-12. The human-year conversion rate is the same either way; the gap is survival, not aging speed. Traffic, infectious disease, and trauma cut outdoor lifespans before most cats reach the senior stage around 11 years.

Start with birthday if you have it - that gives the most precise human-year conversion and milestone calendar. Use weeks/months for young puppies and kittens when the exact birth date is unknown. Use the breed calculator when you know the breed name and age in whole years.