Enter only one age (dog or human). The other age is calculated automatically with an explanation.
If dog age ≤ 2: human age = dog age × 10.5
If dog age > 2: human age = 21 + (dog age - 2) × 4
Reverse conversion uses the same piecewise rule
Dog age is not a fixed 1:7 ratio. Growth is faster in early years and slower later.
This tool uses a common piecewise model: first two years use 10.5 per year, then 4 per year.
You only need one input field. The other value is auto-filled with a clear “equivalent age” explanation.
Results are for daily reference. Real health assessment depends on breed, size, and veterinary advice.
This is a one-way conversion per calculation. Filling both causes conflicts.
No, it is a common practical conversion model.
Yes, decimal values are supported.
Dogs develop much faster during the first two years.
Yes, enter a value in the human age field.
No, please consult a veterinarian for medical decisions.
Input dog or human age to get the equivalent age instantly.
Scan the QR code to use this tool on mobile.