Dog Age Calculator (Dog to Human Years)
The old “1 dog year = 7 human years” rule is wrong. This Dog Age Calculator uses a more realistic curve so you can estimate your dog’s age in human years and understand whether it’s in a puppy, adult or senior stage.
Convert your dog’s age to human years
Enter your dog’s age and size category to see:
- Approximate “human age” equivalent
- Life stage (puppy, young adult, adult, senior)
- Rough percentage of expected lifespan already lived
Convert Dog Years to Human Years
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This tool is for educational purposes only and does not replace professional veterinary advice, diagnosis or treatment.
Example
5-year-old medium-size dog
- Approx. human age: ~40–45 years.
- Life stage: established adult (not a senior yet).
- Focus on healthy weight, exercise and preventive vet care.
How to read your dog’s “human age”
1. Young dogs age very fast
Puppies and adolescents gain “human years” quickly in the first 1–2 years, especially large and giant breeds. That’s why early life is so important for training and health.
2. Adult years slow down
Once your dog reaches adulthood, each calendar year adds fewer “human years” than during puppyhood, but joint care, dental care and weight control become crucial.
3. Senior dogs need closer monitoring
As dogs enter their senior years, changes in mobility, appetite, thirst, behavior or sleep should be discussed with a vet sooner rather than later.
Want a full dog age chart?
After using the calculator, open the full guide to see puppy, adult and senior stages with updated non-linear dog-to-human age charts.