Dog Age Calculator
Your dog's age in human years, from the AVMA chart, with the newer DNA-based formula next to it.
Enter your dog's age.
Not veterinary advice. PuppySizer gives estimates from published sources. It cannot examine your pet. For any health concern, ask your own veterinarian. Read the full disclaimer.
Dog years to human years, year by year
| Dog age | AVMA chart (medium dog) | DNA formula (Labrador) |
|---|---|---|
| 1 year | 15 | 31 |
| 2 years | 24 | 42 |
| 3 years | 28 | 49 |
| 4 years | 32 | 53 |
| 5 years | 36 | 57 |
| 6 years | 42 | 60 |
| 7 years | 47 | 62 |
| 8 years | 51 | 64 |
| 9 years | 56 | 66 |
| 10 years | 60 | 68 |
| 11 years | 65 | 69 |
| 12 years | 69 | 71 |
| 13 years | 74 | 72 |
| 14 years | 78 | 73 |
| 15 years | 83 | 74 |
| 16 years | 87 | 75 |
The DNA formula is quoted from university and press coverage of the paper, not from the paper text, and the study did not cover other breeds.
Frequently asked questions
Is one dog year really seven human years?
No. The AVMA chart counts the first year as 15 human years and the second as 24, then adds about 4 to 5 human years for each year after that for a medium-sized dog. A 7-year-old dog is about 47 in human terms on that chart, not 49, and a 1-year-old is 15, not 7.
Why are there two answers?
The AVMA chart comes from veterinary convention. The second figure comes from a 2020 study in Cell Systems that compared DNA methylation in 104 Labrador retrievers with humans and proposed human age = 16 × ln(dog age) + 31. They disagree a lot: the DNA formula gives 31 for a 1-year-old dog against 15 on the AVMA chart, and 75 at 16 years against 87. That spread shows how approximate any conversion is.
Does breed or size matter?
Yes. The AVMA chart used here is for a medium-sized dog of 21 to 50 lb, and the AVMA notes that many other factors, including weight and breed, may influence the aging process. The DNA-based formula was fitted on one breed. Treat both as rough guides.
What about puppies under one year?
The AVMA chart starts at age 1. The DNA formula is not meaningful for puppies, because the logarithm turns negative below about 7 weeks. The calculator therefore gives no number under a year.
Why does the calculator stop at 16?
Both sources stop there: the AVMA chart runs from 1 to 16 years. Beyond that the figures would be extrapolation.
Sources
- PETS age faster than PEOPLE. American Veterinary Medical Association. Read 2026-11-08. Used for: Human-year equivalents for cats and for a medium-sized dog (21 to 50 lb), ages 1 to 16.
- Quantitative translation of dog-to-human aging by conserved remodeling of the DNA methylome. Wang T et al. Cell Systems 11:176-185 (2020). Read 2026-11-08. Used for: Human age = 16 x ln(dog age) + 31, fitted on 104 Labrador retrievers. The formula is quoted from university and press coverage of the paper (for example today.ucsd.edu), not from the paper text.
Facts last checked against their sources on November 8, 2026. Read how the numbers are built on the sources and method page.