Dog Age Calculator
Convert your dog's age to human years using the latest scientific formula
Your dog in human years
39
Life stage: Adult
Dog Age to Human Age Chart (Medium dogs)
Frequently Asked Questions
Is the 7-year rule accurate?▼
No - the old 'multiply by 7' rule is inaccurate. Dogs age faster in their first 2 years, then slow down. A 2-year-old dog is roughly equivalent to a 42-year-old human, not 14.
Do small dogs age differently than large dogs?▼
Yes - small dogs tend to live longer and age more slowly after maturity. A 10-year-old Chihuahua is roughly 56 in human years, while a 10-year-old Great Dane is about 66.
What is the new scientific formula?▼
The 2019 UC San Diego study found that dog aging follows a logarithmic curve: human_age = 16 × ln(dog_age) + 31. This tool also adjusts for breed size.
How to Use Dog Age Calculator
- 1Open the Dog Age Calculator tool above - it loads instantly in your browser.
- 2Enter your data or upload your file. Everything is processed locally on your device - nothing is uploaded to any server.
- 3Get your results instantly. Copy, download, or share - completely free with no signup required.
Dog Age Calculatoris part of BriskTool's collection of free online tools. All tools run entirely in your browser for maximum privacy and speed.