Dog Age Calculator
Convert your dog's age to human years using the science-based formula. Results vary by breed size.
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Enter your dog's age and size to see their human age equivalent!
How Do We Calculate Dog Age in Human Years?
The old "1 dog year = 7 human years" rule is a myth. Dogs age rapidly in their first two years of life, then slow down. The actual rate also depends heavily on breed size — small dogs live longer than giant breeds.
Our calculator uses a size-adjusted formula based on the American Veterinary Medical Association (AVMA) guidelines and published research on canine aging to give you a much more accurate result.
Year 1: The Puppy Sprint
A dog's first year is equivalent to roughly 15 human years. Puppies go from newborn to full sexual maturity in just 12 months — a development that takes humans over a decade.
Size Matters
Small dogs (Chihuahuas, Pomeranians) commonly live 14–18 years. Giant breeds (Great Danes) often only live 7–10 years. Size is the single biggest predictor of canine lifespan.
Senior Dog Care
Dogs are considered "senior" from age 7–8 (large breeds) or 10–11 (small breeds). Once your dog hits senior status, vet visits should move to every 6 months instead of annually.
The Science (NIH 2019)
A 2019 NIH study found dog aging correlates with DNA methylation patterns in humans. The relationship is logarithmic — dogs age fastest early in life and slow down with age.
Treat Your Senior Pup
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Frequently Asked Questions
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