🐕 Pet Age Calculator
Convert your dog or cat's age to human years — breed-size-adjusted formula.
❓ Frequently Asked Questions
How old is my dog in human years?
The old "1 dog year = 7 human years" rule isn't accurate. A better formula: the first year equals ~15 human years, the second adds ~9 years, and each year after depends on breed size. Small breeds age slower (4 years per dog year), while giant breeds age faster (7 years per dog year). Our calculator uses this breed-size-adjusted formula for accuracy.
Why do small dogs live longer than large dogs?
Small dogs tend to age slower metabolically and have fewer growth-related health issues. Large and giant breeds grow rapidly, which puts more stress on their bodies and accelerates aging. A small dog reaching 15–18 years is common, while a giant breed rarely exceeds 10–12 years.
How old is my cat in human years?
Cats age fastest in their first two years: the first year ≈ 15 human years, the second ≈ 9 years, then about 4 years per cat year after that. A 10-year-old cat is roughly 57 in human years — officially a senior who may benefit from senior-specific health products. Shop senior cat products →
Is the "1 dog year = 7 human years" formula correct?
No, it's a myth. Dogs mature much faster in their first two years than the 7:1 ratio suggests. The 7:1 rule dates from a time when the average human lifespan was ~70 years and dogs lived ~10 years, but it doesn't account for breed size differences. Modern veterinary formulas use the 15-9-x model for more accurate results.