Pet
Dog Age in Human Years Calculator
Convert a dog's age to a rough human-equivalent age using the logarithmic ageing curve.
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Formula
For dogs aged one and over, human-equivalent age is about 16 times the natural log of dog age, plus 31; puppies under one are scaled roughly linearly.
How it works
The logarithmic curve reflects that dogs age fast early and then more slowly. Breed size shifts real ageing a lot, so this is a population guide, not a breed-specific figure.
FAQs
Why not multiply by 7?
The old 7-times rule ignores that puppies age much faster than older dogs.
Do big dogs age faster?
Yes, large breeds tend to age faster than small breeds.
Is this a health check?
No. It is an age comparison only.
General information only, not veterinary advice.
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