Dog years converter
Convert your dog’s age into human years. The old "multiply by seven" rule is wrong: puppies grow up fast, and big dogs age quicker.
That's 1.56× as old as a young adult, while an adult in their forties is 1.07× older. Based on veterinary tables, not the old "times seven" rule.
What it means
How old is that really?
Based on the standard veterinary tables: 15 human years for the first year, 9 for the second, then a rate that depends on size.
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Three things worth knowing
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15, then 9, then size
Year one is 15 human years, year two adds 9, and each year after adds 4.5 for a small dog and 7.5 for a giant breed.
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Where "times seven" came from
Nobody knows who first said it. It simply compared a 70-year human life with a 10-year dog life, and was never based on biology.
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Size changes everything
Small dogs commonly reach 16; giant breeds rarely pass 8. Using one formula for every dog gets the later years badly wrong.
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Background
About pet ages
A one-year-old dog is roughly a 15-year-old human: fully grown and barely out of adolescence. The second year adds about 9 more, and after that each year adds between 4 and 7 depending on size.
Big dogs age fastest: a 10-year-old Great Dane is about 84 in human terms, a 10-year-old terrier about 60.