Dog and Cat Age Calculator

No. The «1 dog year = 7 human years» rule is debunked. AAHA and AVMA use a non-linear curve: a dog's first year is roughly 15 human years, the second adds about 9 (so 2 dog years ≈ 24 human years), then each adult year adds 4 to 7 human years depending on breed size.

Smaller breeds live longer and age more slowly in adulthood (about 4 human years per dog year). Larger and giant breeds compress more of life into fewer years (5 to 7 human years per dog year past age 2). Lifespan estimates and senior-stage thresholds shift accordingly.

AAFP guidelines: year 1 = 15 human years, year 2 adds 9 (cumulative 24), then each subsequent year adds 4. Cats are size-agnostic, but indoor vs outdoor lifestyle affects lifespan more than breed.

Puppy or kitten (under 1 year), Junior (1–2), Adult (2 to 6–9 depending on size for dogs, 2–11 for cats), Senior, then Geriatric. The cutoffs follow AAHA Canine Life Stage and AAFP Feline Life Stage frameworks.

It is an estimate. Individual pets vary widely based on genetics, weight, diet, exercise, and vet care. Many pets live well beyond breed averages with good care; some health issues shorten life. Your vet remains the source of truth.