Use the Dog Age Calculator for a rough guide to a dog age in human years. It is a guide only, because size and breed also make a difference.
How to Use
Enter the dog age in years, using a decimal for part of a year if needed, then press Calculate.
Formula in Plain Words
The first year counts as 15 human years and the second year adds 9 more. After that, each extra dog year adds 5 human years.
Worked Example
For a dog aged 3 years, the guide gives 24 human years for the first two years plus 5 for the third year, which is 29 human years. A 5-year-old dog gives 39 human years.
FAQs
Is this exact?
No. It is a rough guide, and the true comparison depends on size, breed and health.
Can I enter part of a year?
Yes. For example, enter 0.5 for a 6-month-old puppy.
Why is the first year worth so much?
Because dogs grow and mature much faster than people in their first year or two.