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Dog Age Calculator - Dog Years to Human Years

Free dog age calculator. Convert your dog's age to human years accurately based on size. The 7-year rule is a myth!

Convert dog years to human years

Enter your values to see results

and click the "Calculate" button

Dog Age Calculator

Calculate your dog's age in human years. The old '1 dog year = 7 human years' is a myth. Size matters - small dogs age slower than large dogs.

Year 1 = 15 human years | Year 2 = 9 more | After: 4-5 per year (varies by size)

Large dogs age faster. A 7-year-old Great Dane is senior, while a 7-year-old Chihuahua is middle-aged.

Why do small dogs live longer?

Larger dogs age faster at cellular level. Giant breeds (Great Dane, Mastiff) average 7-10 years. Small breeds average 12-16 years.

When is my dog a senior?

Small dogs: 10-12 years. Medium: 8-10 years. Large: 6-8 years. Giant: 5-6 years. Senior dogs need more vet visits.

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