🏃 Health & Fitness
Dog Age Calculator
The old seven-to-one rule is wrong in both directions: dogs mature far faster in their first two years, and small breeds then age more slowly than large ones. Size is the single best predictor of lifespan, which is why the conversion differs by breed.
How it works
Dog age
Extra months
Breed size
Human years equivalent
Life stage
Dog age
Typical life expectancy
Through their expected lifespan
Old seven-to-one estimate
Vet check frequency
Frequently asked questions
How do I use the Dog Age Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.