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An estimate; indoor cats often live longer. Everything is calculated in your browser; nothing you type is uploaded.

1 month ≈ 1 human year, 6 months ≈ 10, 1 year = 15, 2 years = 24, then 4 human years per cat year. Life stages follow the AAHA/AAFP feline guidelines.

An 8-year-old cat is about 48 in human years: 15 for the first year, 24 at two, then 4 more each year.