Pet Age Calculator

Choose your pet, its size and age to see its age in human years.

Pet

Dog size

Age (years)

–

Not just "times seven"

The old rule of seven human years per pet year is too simple. Dogs and cats grow up very fast: by their first birthday they are roughly like a 15-year-old, and by two like a 24-year-old. After that each year counts as about 4 human years for cats and small dogs, and up to 6–7 for large and giant breeds, which age faster and usually have shorter lives.

The DNA-based formula

A 2020 study of Labrador retrievers compared DNA changes with humans and proposed human age ≈ 16 × ln(dog age) + 31. It is shown as a second estimate for dogs one year or older; it was based on one breed, so treat it as interesting rather than exact.

Why it matters

Knowing your pet's life stage helps with food choice, vaccinations and check-ups. Senior pets benefit from yearly vet visits. These are averages — health, breed and care make a big difference.

Free to useNo software to install — works in any modern browser.

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Runs in your browserNothing you enter is sent to a server.

Works on mobileSame tool on your phone, tablet or desktop.

How it works

Enter — type or paste your values or text.
Get the result — it is worked out in your browser.
Adjust — change the inputs to compare, or copy the result.

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