What is the Dog Age Calculator?
Convert a dog's age into human years by size.
Enter dog's age and size and the Dog Age Calculator returns age in human years. Results update as you type, and nothing you enter leaves your device.
How it is calculated
First year = 15 human years, second year = 9, then 4 to 6 for each further year depending on size
How to use it
- Enter dog's age in years.
- Choose size.
- Read age in human years in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Dog Age Calculator use?
It uses: First year = 15 human years, second year = 9, then 4 to 6 for each further year depending on size.
What do I need to use the Dog Age Calculator?
You need dog's age and size. Sensible starting values are filled in so you can see how it works straight away.
Is the Dog Age Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.