DayTally

Cat age in human years

Enter your cat's age in years.

  • Exact calendar math · cited sources (EIA, U.S. law)
  • Updated Oct 23, 2026
  • Runs in your browser
  • Methodology
  • Instant answers. Results update as you type, with a visual breakdown.
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  • Sourced and private. Exact calendar math · cited sources (EIA, U.S. law). Nothing you enter leaves your device.

The chart we use

The common veterinary chart (used by International Cat Care) treats a 1-year-old cat as about 15 and a 2-year-old as about 24, then adds roughly 4 human years per cat year.

Cat ageHuman years (≈)
115
224
328
432
640
848
1056
1264
1472
1680
1888
2096

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Frequently asked questions

How old is a 10-year-old cat in human years?

About 56.