Enter your figures
Enter the values below. Use the units shown for each field.
Formula / methodFor a simple reference estimate: first dog year ≈ 15 human years, second ≈ 10 more, then a size-dependent rate is applied.
Your result
Calculated from your inputs.
Approximate human-age equivalent
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Dog age
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Size
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Reference note: This is a reference estimate, not a biological conversion. Aging varies substantially by breed and individual dog.
How to use this calculator
What to enter
Enter or select the following as requested: Dog age; Dog size. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The date or duration result is calculated from the entered dates, times, calendar rules, and exclusions. Check inclusive versus exclusive counting, time zone, daylight-saving changes, and whether weekends or holidays are excluded.
When to use it
Use this to plan a date, measure elapsed time, or estimate a deadline. Verify the relevant calendar, location, and legal or workplace rules when they affect the answer.