Pet Age Converter (Human Years)
Convert your dog or cat's age to human years accurately. Gamified tool adjusting for breed size and weight classes with animated growth stages.
About
The old rule of "one dog year equals seven human years" is a myth. In reality, pets age much faster during their first two years of life and then slow down. Furthermore, size matters immensely - small dogs generally live longer and age slower than giant breeds, who are considered seniors by age 6 or 7.
This tool uses the latest veterinary aging curves to give you a precise equivalent. It accounts for the rapid maturity of puppies and kittens (where the first year is equal to about 15 human years) and the specific aging factors of different weight classes. Knowing your pet's "real" age helps you provide age-appropriate care, nutrition, and medical screenings.
Formulas
There is no single linear formula, but the American Veterinary Medical Association (AVMA) generally accepts:
- Year 1: Equals 15 human years.
- Year 2: Adds 9 years (Total 24).
- Year 3+: Adds roughly 4-5 years per calendar year, depending on weight.
For cats, the formula is more consistent after year 2:
Reference Data
| Pet Age | Small Dog (Human yrs) | Medium Dog (Human yrs) | Large Dog (Human yrs) | Cat (Human yrs) |
|---|---|---|---|---|
| 1 Year | 15 | 15 | 15 | 15 |
| 2 Years | 24 | 24 | 24 | 24 |
| 3 Years | 28 | 28 | 28 | 28 |
| 5 Years | 36 | 36 | 36 | 36 |
| 7 Years | 44 | 44 | 44 | 44 |
| 10 Years | 56 | 60 | 66 | 56 |
| 12 Years | 64 | 69 | 77 | 64 |
| 15 Years | 76 | 83 | 93 | 76 |