Tools / Dog & cat age in human years
Dog & cat age calculator: human years
Choose dog or cat, the size and the age. The calculator converts the age into human years using the common veterinary rule of thumb.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Choose dog or cat.
- For dogs, pick the size class.
- Enter the age – decimals like 1.5 are fine.
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Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
Is one dog year really seven human years?
No, that is a myth. Dogs mature much faster in the first two years and then age more slowly; large breeds age faster than small ones.
When is a dog a senior?
Large dogs from about 6–7 years, small dogs from about 9–10 years.
How old is a cat in human years?
A one-year-old cat is about 15, a two-year-old about 24; after that each year adds about 4 human years.