Jack Russell Terrier Age Calculator
The Jack Russell Terrier is a small breed (under 20 lbs) that typically lives 13 to 16 years. Enter your dog's age to see it in human years.
Your Jack Russell Terrier is about
28 human years
Life stage: Adult · Small breed
This uses the modern size-adjusted method, not the old "multiply by 7" rule. It's a close estimate, not an exact figure.
Jack Russell Terrier age chart
| Jack Russell Terrier age | Human years | Life stage |
|---|---|---|
| 1 year | 15 | Adolescent |
| 2 years | 24 | Adult |
| 3 years | 28 | Adult |
| 4 years | 32 | Adult |
| 5 years | 36 | Adult |
| 6 years | 40 | Adult |
| 7 years | 44 | Adult |
| 8 years | 48 | Mature |
| 9 years | 52 | Mature |
| 10 years | 56 | Mature |
| 11 years | 60 | Senior |
| 12 years | 64 | Senior |
| 13 years | 68 | Senior |
| 14 years | 72 | Senior |
| 15 years | 76 | Senior |
| 16 years | 80 | Senior |
Frequently asked questions
How old is a Jack Russell Terrier in human years?
It depends on their exact age. As a small breed, a Jack Russell Terrier's first year is about 15 human years, and by age 2 they're around 24. After that each year adds roughly 4 human years. Use the calculator above for your dog's exact age.
How long do Jack Russell Terriers live?
Jack Russell Terriers typically live 13 to 16 years. Good nutrition, regular vet checkups, dental care, and a healthy weight all help your dog live a longer, more comfortable life.
Is the "multiply by 7" rule accurate for a Jack Russell Terrier?
No. That old rule overestimates aging in the early years and ignores size. This calculator uses the modern size-adjusted method instead, which is a much closer estimate for a Jack Russell Terrier.
This is a general estimate using the size-adjusted method, not an exact figure or medical advice. Your vet can best assess your dog's life stage and health.
Other small breeds
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