Dog Age Calculator (to Human Years)

Convert your dog's age to human years with the AKC method — the first year counts 15, the second 9, then by size.

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Formula

AKC method: the first dog year ≈ 15 human years, the second adds ≈9, and each year after adds ≈4 (small ≤20 lbs), 5 (medium 21–50 lbs), 6 (large 51–90 lbs) or 7 (giant >90 lbs).

Examples

InputResult
1 year, any size15 human years
2 years, medium dog24 human years
5 years, medium dog39 human years
10 years, large dog (60 lbs)72 human years

Frequently Asked Questions

Why isn't it just 7 dog years per human year?

The old ×7 rule ignores how dogs develop: they reach adulthood in about two years. The AKC method — 15 for the first year, 9 for the second, then size-dependent — matches veterinary observation much better.

Why does size matter?

Larger dogs age faster biologically and have shorter lifespans (a Great Dane's life expectancy is ~7 years, a Chihuahua's ~15), so each extra year counts more human years.

How accurate is this?

It's a well-accepted estimate, not a lab result. Individual breed, genetics and health matter — use it for intuition, and your vet for health decisions.

What stage is my dog in?

Roughly: under 1 year puppy, 1–2 junior, 2–7 adult, 7+ senior — though giant breeds are considered senior from about age 5–6.

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