Pet age calculator in human years
The conversion uses a fixed table by species and size: the first year of life corresponds to about 15 human years, the second year adds 9, and from then on each year is worth a fixed number of human years — the larger the dog's size, the higher the number.
Conversion table used
| Stage | Dog | Cat |
|---|---|---|
| 1st year of life | 15 human years | 15 human years |
| 2nd year of life | +9 (total 24) | +9 (total 24) |
| Each following year | Small: +4 · Medium: +5 · Large: +6 · Giant: +7.5 | +4 |
Formula and sources
- • AVMA (American Veterinary Medical Association) dog/cat age → human age conversion table, built into this page's code.
- • AAHA Canine Life Stage Guidelines (2019) — definition of dog life stages by size.
- • AAFP/AAHA Feline Life Stage Guidelines — definition of cat life stages.
Important: This age conversion is a statistical approximation and varies between individuals of the same species and breed. This result is an educational estimate, not a diagnosis or prescription, and does not replace a consultation with a veterinarian.
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