Dog Age Calculator
Convert your dog's age to human years using the updated veterinary formula. Results vary by dog size — small dogs age differently than large breeds.
Inputs
Results
Human Equivalent Age
39 years
How to Use This Calculator
- Enter Dog Size, Small (under 20 lbs), and Medium (20-50 lbs).
- Set Large (50-100 lbs), Giant (over 100 lbs), and Dog.
- Adjust Additional Months as needed.
- Review the Human Equivalent Age (years) result.
- Use Life Stage and Average Life Expectancy (years) to inform your decision.
How the result changes with Dog's Age (years)
| Dog's Age (years) | Human Equivalent Age |
|---|---|
| 3 | 29 years |
| 11 | 69 years |
| 20 | 114 years |
| 27 | 149 years |
What each input means
- Dog Size
- Size category affects aging rate after age 2.
How this is calculated
Worked example, using the default values
- Identify Input ParametersDog Size = 1, Dog's Age (years) = 5, Additional Months = 0 = 3 input(s) provided
- Calculate Human Equivalent Age39 = 39
- Calculate Life StageLife StageAdult = Adult
- Calculate Average Life Expectancy12 = 12
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