Dog Age Calculator
Convert your dog's age into human years by size — small, medium or large breed — free online. — free, fast and private.
Your result will appear here.
How to use Dog Age Calculator
- Enter your dog's age in years.
- Choose the breed size — small, medium or large.
- Click Calculate Human Age to see the result.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
Is one dog year really seven human years?
No — that old rule is inaccurate. Dogs age fast in their first two years (about 15 human years in year one, 9 more in year two), then roughly 4–6 human years per year depending on size. Large breeds age faster after year two.
Is this tool free to use?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — nothing you enter is uploaded to a server.
Can I use it on my phone?
Yes, it is fully mobile-friendly and works in any modern browser on phone, tablet or computer.