3 Dog Years = ~29 human years
Adult · ≈29 human yrs
Adult dogs are in their most stable life stage and enjoy a wide range of activities.
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 Dog 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 Dog Age Calculator to count working days between today and a milestone, excluding weekends and holidays.
Someone calculates age, anniversary, or countdown days with the Dog Age Calculator when planning an event or booking travel.
An HR coordinator verifies tenure, probation end dates, or PTO accrual periods using the Dog Age Calculator for consistent date math.
Use our free Dog Age Calculator for fast, accurate results in your browser. No signup or installation required — works on any device.