Dog Age Calculator
Calculate your dog's age in human years by size and breed. Free dog age calculator used by vets and pet owners worldwide.
Results
⚠️ Human-year equivalents are estimates based on veterinary size guidelines. Consult your vet for health assessments.
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Frequently asked questions
How do you calculate a dog's age in human years?
The first year equals ~15 human years, the second ~9 more (24 total). After that, each dog year equals 4–6 human years depending on size. Large breeds age faster than small breeds.
Is the '1 dog year = 7 human years' rule accurate?
No — it's a myth. The actual ratio varies by age and size. A 2-year-old large dog is equivalent to roughly a 26-year-old human, not 14.
At what age is a dog considered senior?
Small breeds: 10–12 years. Medium breeds: 8–10 years. Large breeds: 7–8 years. Giant breeds: 5–6 years. Veterinary guidelines vary by breed.
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