Dog & Cat Age in Human Years
Convert a dog’s or cat’s age to human years by size and species, using veterinary association charts. Estimates only.
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How to use
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Choose dog or cat
For dogs, pick the size by adult weight
Enter the age and see it in human years
How it works and good to know
Cats follow the AAHA/AAFP 2021 life stage guidelines table (1 year = 15, 2 years = 24, then +4 per year), and dogs follow the American Veterinary Medical Association (AVMA) table by weight (small up to 9 kg, medium, large and giant). Ages under one year and values between table rows are interpolated in a straight line. For dogs aged 1 and over, the DNA methylation formula from UC San Diego research (16·ln(age) + 31) is shown as well. All values are approximate.