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Dog Age Calculator
Convert your dog's age to human years using the size-based chart vets use, plus the newer DNA-methylation formula - for small, medium, large and giant breeds.
How to use it
- Enter your dog's age in years and months.
- Pick the expected adult weight class.
- Read the human-age equivalent and the life stage.
How it works
The old "multiply by 7" rule is wrong: dogs mature very fast in the first two years (a 1-year-old is roughly a 15-year-old human, a 2-year-old about 24), and then age at a rate that depends on size - big dogs age faster. The chart used here follows the widely cited size-based guidance (similar to the AVMA/AAHA charts).
A 2020 study of Labrador DNA methylation (Wang et al., Cell Systems) proposed human age ≈ 16 × ln(dog age) + 31; it is shown for comparison and was derived from one breed.
FAQ
Is one dog year seven human years?
No. The first year equals about 15 human years and the second about 9 more; after that it is roughly 4-7 years per dog year depending on size.
Do small dogs live longer?
Generally yes; many small breeds live 13-16 years, while giant breeds average 8-10.
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