Pet Age
Express a dog’s or cat’s age as a human-age analogy using an internal piecewise model. The comparison can prompt discussion about growth but does not assess health or remaining lifespan.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Choose the species, age and, for a dog, size category. Early ages use fixed bands rather than a smooth month-by-month growth model, which limits interpretation for young animals.
Results and examples
The built-in cat model assigns 24 at age two and adds four per later year, giving 28 at age three. That number does not establish biological equivalence to a human of that age.
Limitations
- Breed, illness, living conditions and individual variation are not diagnosed.
- Some size-band boundaries are discontinuous; do not use the result for clinical or lifespan decisions.
Fields
| Field | Guidance and constraints |
|---|---|
| Type | Check the unit and format displayed beside this field. |
| Dog size | Check the unit and format displayed beside this field. |
| Age (years) | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How is a three-year-old cat represented?
The built-in cat model assigns 24 at age two and adds four per later year, giving 28 at age three. That number does not establish biological equivalence to a human of that age.
Can the result assess health or lifespan?
Breed, illness, living conditions and individual variation are not diagnosed. Some size-band boundaries are discontinuous; do not use the result for clinical or lifespan decisions.
