Dog Age Calculator
Convert your dog's age to human years using the science-based formula. Results vary by breed size.
Tell us about your dog
Result
Enter your dog's age and size to see their human age equivalent!
How Old Is Your Dog in Human Years?
Enter your dog's age and size group, and this free calculator converts it to human years — because a 5-year-old Chihuahua and a 5-year-old Great Dane are very different ages in human terms.
You also get a life-stage badge (puppy, adult, senior) and fun age facts. All calculations run instantly in your browser.
Size-aware conversion
Small, medium, and large breeds age at different rates — the calculator adjusts the conversion for your dog's size group.
Life stage and fun facts
See whether your pup is a puppy, adult, or senior, plus fun facts matched to their age.
Why size matters
The old 'multiply by 7' rule is a myth — large breeds age faster than small ones. Size-adjusted conversion gives a far more realistic human-age equivalent.
How to use
- Enter your dog's name and age.
- Pick their size group.
- Click Calculate to see the human-age equivalent, life stage, and fun facts.
Frequently Asked Questions
How do you convert dog years to human years?
By accounting for size and breed aging rates — small dogs age slower than large dogs, so the calculator adjusts the conversion by size group.
Is the 'multiply by 7' rule accurate?
Not really — it is a rough average. Dogs mature much faster in their first two years, and large breeds age faster overall.
What are the life stages?
Puppy, adult, and senior — the calculator assigns a stage badge based on your dog's converted age.
Does it work for mixed breeds?
Yes — just pick the size group closest to your dog's adult weight.
Is the calculator free?
Yes, free with no signup.
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