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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.

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.
Options

## More unit & math tools

- [Unit converter](/converters/units)
- [Date calculator](/time/date-math)
- [Fraction calculator](/converters/fractions)
[All unit & math tools](/converters)

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Canonical HTML: https://nutter.tools/converters/dog-age-calculator
Markdown version: https://nutter.tools/converters/dog-age-calculator.md
Plain-text version: https://nutter.tools/converters/dog-age-calculator.txt
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