Work out pet age in human years instantly with clear inputs, formula shown and shareable results.
This follows the veterinary convention: the first year counts as about 15 human years, the second adds 9, and each year after that adds 4 to 6 depending on species and breed size. The flat seven years per dog year rule is badly wrong at both ends of a dog's life, which is why the staged version is used clinically.
Conversion
year 1 = 15 human years; year 2 adds 9; each later year adds 4 to 6 by size
year 1 = 15 human years; year 2 adds 9; each later year adds 4 to 6 by size. This follows the veterinary convention: the first year counts as about 15 human years, the second adds 9, and each year after that adds 4 to 6 depending on species and breed size.
The flat seven years per dog year rule is badly wrong at both ends of a dog's life, which is why the staged version is used clinically.
Enter pet's age, species and size. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.