Dog & Cat Age Calculator
Estimate your pet's age in human years. Dog aging depends on adult size; cat aging follows a standard curve.
Pet details
Human age equivalent:
How this is calculated
Dogs: Year 1 = 15 human years, Year 2 adds 9 more (24 total at 2 years). Each year after that adds 4 (small/medium), 5 (large), or 6 (giant) human years — larger breeds age faster after maturity.
Cats: Year 1 = 15 human years, Year 2 adds 9 more (24 total at 2 years). Each year after that adds 4 human years, regardless of breed size.