Age Calculator

  • Chronological Age Calculator
    Calculate exact chronological age in years, months and days between a birthdate and any as-of date, plus total months, weeks and days.
  • Generation Calculator by Birth Year
    Find your generation by birth year — Baby Boomer, Gen X, Millennial, Gen Z or Gen Alpha — using the widely cited Pew Research cohort ranges.
  • Zodiac Sign by Birthdate Calculator
    Find your zodiac (sun) sign instantly from your birth month and day. Maps your birthdate to the 12 astrological signs with element and date range.
  • Chinese Zodiac Sign Calculator
    Find your Chinese zodiac animal by birth year. Enter a year to get your sign (Rat, Ox, Tiger…) plus its fixed five-element association.
  • Cat Years to Human Years Calculator
    Convert your cat's age into human years instantly. First year = 15, second = +9, each year after = +4 human years. Free and accurate.
  • Dog Years to Human Years Calculator
    Convert your dog's age into human years with the science-based logarithmic formula. Enter your dog's age to instantly see its equivalent human age.
  • Days Until My Birthday Calculator
    Count down to your next birthday. Enter your birth month and day to find out exactly how many days, weeks, and months are left until your big day.
  • Half Birthday Calculator
    Find your half birthday instantly. Enter your birth date and we add 6 months (or 182 days) to reveal the exact date you turn half a year older.
  • How Old Am I? Exact Age Calculator
    Find out exactly how old you are right now in years, months, days, hours, minutes and seconds from your date and time of birth. Free, leap-year aware.
  • Age Between Two Dates Calculator
    Calculate exact age between two dates in years, months and days, plus weeks, total days, hours and more. Solve date of birth or date of death too.
  • Minimum Age "Born On or Before" Date Calculator
    Find the latest date of birth (born on or before cutoff) so a person is at least a given minimum age — 21, 18, 16, 13 — on any check date. Great for ID checks.
  • Generation Calculator
    Find out which generation you belong to — Baby Boomer, Gen X, Millennial, Gen Z or Gen Alpha — by entering your birth year. Instant, free.
  • What Grade Was I In Calculator
    Find what US grade you were in during any school year. Enter your birth year and the year to get your K-12 grade level instantly.
  • Age on Other Planets Calculator
    Find out how old you'd be on Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune. Just enter your Earth age to see your age on every planet.
  • Graduation Year Calculator
    Estimate your expected graduation year from your current year, total program length, and years already completed. Quick, free graduation date tool.
  • Dog & Cat to Human Age Calculator
    Convert your dog's or cat's age into equivalent human years using the standard biological aging guideline. Supports small/medium dogs, cats and large dogs.
  • Dog Life Expectancy Calculator
    Estimate your dog's life expectancy from its adult weight. Smaller dogs tend to live longer than large breeds — get a quick lifespan estimate.
  • Days Old Calculator
    Find out exactly how many days old you are. Enter your birth date and an end date to get total days, weeks, and hours between two dates.
  • Date of Birth Calculator
    Calculate someone's date of birth from a known age. Enter a reference date and an age in years, months, and days to get the exact DOB and weekday.
  • How Old Was I Calculator
    Find out how old you were on any past date. Enter your birth date and an event date to get your exact age in years, months, and days.
  • Age Word Problem Calculator (Parent's Age N Times the Child's)
    Solve the classic age word problem: find when a parent's age will be N times the child's age, plus each person's age at that time. Free, instant, exact.
  • Adjusted (Corrected) Age Calculator
    Calculate a premature baby's corrected (adjusted) age from chronological age and gestational age at birth. Free, instant, in weeks and months.
  • Birth Year Calculator
    Find your birth year from your current age. Enter age and year, and choose if your birthday has happened to get an exact year of birth.
  • Birth From Death Date Calculator
    Estimate someone's date of birth from their death date and age at death. Subtract years, months and days to find the birth date instantly.

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