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  1. Home
  2. Units & math
  3. Dog age calculator
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Dog age calculator

Turns a dog's age in years and months into human-equivalent years by size class, with the life stage and an optional lifespan comparison.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

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Enter the dog's age to convert it.

Multiply by seven is a myth. This tool uses the piecewise curve behind most vet handouts: the first dog year counts about 15 human years, the second adds about 9, and every year after adds a size-dependent amount, because small dogs age slower than giant ones. It is a population approximation, not a DNA-methylation measurement like the 2020 epigenetic clock study, and it is not a veterinary opinion on your dog's health.

The dog

Size classAn adult weight below overrides this
More settings▾

Weight bands: small up to 9 kg, medium to 25 kg, large to 45 kg, giant above. A real weight beats the picked class.

Age caps at 30 years and 11 months. The lifespan field is optional; without it the tool uses a breed-size average.

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