Cat age
A 1-year-old cat is already mature. Multiplying by four misses that first jump.
Year one
At their first birthday most cats are sexually and physically mature — closer to a 15-year-old human than a toddler.
Year two
A 2-year-old cat is roughly in their mid-20s. After that, add about 4 human years per calendar year.
Breed
Unlike dogs, cat size does not rewrite the chart. Maine Coons and Ragdolls just take longer to finish growing.
Senior
Many vets call cats senior around 11 and watch kidneys and thyroid more closely from there.
Your cat
Enter their age. The calculator uses the front-loaded curve, with a small nudge for slow-maturing breeds.
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