The most accurate dog age calculator on the web.
Convert your dog's age into human years using three vet-trusted methods — the 2019 epigenetic formula, breed-size aging, and the classic 7× rule. Free, private, and instant.
NewComplete Dog Age Calculator guide (2026) — all 3 methods explained
Your dog
Enter age and size — we'll do the rest.
In human years
Three methods — the first is the most scientifically accurate.
Based on DNA methylation research (Wang et al., UC San Diego).
Why "1 dog year = 7 human years" is wrong
Dogs don't age linearly. They mature very fast in the first two years and then slow dramatically. A 1-year-old Labrador is more like a 30-year-old human than a 7-year-old child. Our calculator uses the same 2019 epigenetic study that veterinary researchers now reference.
- 01Epigenetic formula16 × ln(dog age) + 31. Most accurate, especially for adults.
- 02Breed-size methodAdjusts aging by adult weight. Trusted by the AKC and most vets.
- 03Life-stage detectionIdentifies puppy, adult, senior or geriatric stages by size.
- 04Classic 7× ruleKept for comparison only — useful as a quick gut-check.
Quick dog years to human years chart
A snapshot of how a 1- to 16-year-old dog compares in human years using the 2019 epigenetic formula and breed-size method.
| Dog age | Epigenetic | Small | Medium | Large | Giant |
|---|---|---|---|---|---|
| 1 yr | 31 | 15 | 15 | 15 | 15 |
| 2 yr | 42.1 | 24 | 24 | 24 | 24 |
| 3 yr | 48.6 | 28 | 29 | 30 | 31 |
| 5 yr | 56.8 | 36 | 39 | 42 | 45 |
| 7 yr | 62.1 | 44 | 49 | 54 | 59 |
| 10 yr | 67.8 | 56 | 64 | 72 | 80 |
| 13 yr | 72 | 68 | 79 | 90 | 101 |
| 16 yr | 75.4 | 80 | 94 | 108 | 122 |
Dog age calculator FAQ
How accurate is this dog age calculator?+
The epigenetic method is based on peer-reviewed 2019 research and is the most accurate for dogs aged 1 year and older. The breed-size method is the standard used by veterinarians and the American Kennel Club.
Why does breed size matter?+
Large and giant breeds reach maturity slightly later but age much faster afterwards. A 7-year-old Great Dane is biologically older than a 7-year-old Chihuahua.
Is the classic 1=7 rule wrong?+
Yes. It assumes dogs age uniformly, which they don't. We include it only because it's still widely searched.
Do you store my dog's information?+
No. Everything runs in your browser — we don't track, save, or share any inputs.
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How a modern dog age calculator actually works: the 2019 epigenetic study, breed-size curves, and the truth about the 1:7 myth — explained in plain English.
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Use our breed-specific dog age calculator to convert dog years to human years accurately for small, medium, large and giant breeds.