Pet age calculator — dog & cat to human years

Convert your pet's age into a human-equivalent age. Dogs use a size-aware AAHA formula; cats use the AVMA standard.

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human-equivalent years · —

FAQ

Why does dog size matter?

Larger dogs age faster than smaller ones. A 10-year-old Chihuahua is roughly equivalent to a 56-year-old human; a 10-year-old Great Dane is closer to 79.

How accurate is "7 dog years per human year"?

The 1:7 rule is outdated. Dogs mature very fast in the first two years (each year ≈ 12 human years), then slow down. This calculator uses the modern AAHA / DNA-methylation model.