3 Cat Years = ~28 human years
Prime · ≈28 human yrs
Ages 3–6 are a cat's prime—peak physical and mental condition.
Dog: Year 1 = 15 human years, year 2 = +9, then per year by size: Small +4 / Medium +4.5 / Large +5 / Giant +6
Cat: Year 1 = 15 human years, year 2 = +9, then +4 per year after that
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The Cat Age Calculator performs date math using the proleptic Gregorian calendar. Leap years follow the standard 4/100/400 divisibility rules.
Days = End Date − Start DateWhen time zones are involved, offsets are applied before differencing. Daylight saving transitions are accounted for using IANA timezone data.
Working-day calculations exclude weekends and optionally public holidays. Custom holiday lists can be applied for locale-specific schedules.
Updated: July 2026
A project manager uses the Cat Age Calculator to count working days between today and a milestone, excluding weekends and holidays.
Someone calculates age, anniversary, or countdown days with the Cat Age Calculator when planning an event or booking travel.
An HR coordinator verifies tenure, probation end dates, or PTO accrual periods using the Cat Age Calculator for consistent date math.
Use our free Cat Age Calculator for fast, accurate results in your browser. No signup or installation required — works on any device.