Dog Age Calculator
Dog years to human years
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About this calculator
The old "multiply by seven" rule is a myth. Dogs age fastest in their first two years and larger breeds age faster afterwards. This calculator uses a size-based approximation.
The formula
Year 1 ≈ 15 human years, year 2 ≈ +9, then +4 / +5 / +6 / +7 per year by size
Worked exampleA 6-year-old medium dog ≈ 24 + 4 × 5 = 44 human years.
Frequently asked questions
Is it exact?
No. Breed, genetics and health matter. Use it as a fun guide.
Why do big dogs age faster?
Larger breeds tend to have shorter lifespans, so each calendar year equals more human years.
How old is my dog if I adopted it?
Your vet can estimate from teeth, coat and eyes.
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