Age Calculator

  • Kitten Age Calculator
    Estimate a kitten's age in weeks and months from its weight. Uses the vet rule of thumb of about 1 pound per month for the first 6 months.
  • School Starting Age Calculator
    Find out how old a child will be on the school cutoff date and whether they meet the minimum starting age. Enter birth date, cutoff date, and required age.
  • When Will I Turn 21 Calculator (US)
    Find the exact date you turn 21 and reach the legal US drinking age. Enter your birthday to see the date and days remaining until you can legally drink.
  • 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.
  • 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.
  • 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.
  • 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.
  • Graduation Year Calculator
    Estimate your expected graduation year from your current year, total program length, and years already completed. Quick, free graduation date tool.
  • Birthday Day of Week Calculator
    Find what day of the week you were born and the weekday of your next birthday. Free day-of-week calculator using Zeller's congruence for any date.
  • 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.
  • 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.
  • Korean Age Calculator
    Calculate your Korean age instantly. The traditional Korean age system adds 1 to your age from birth — enter your birth year and current year.
  • Lunar Age Calculator
    Calculate your lunar age (East Asian nominal age) from your birth year. Used in Korea, China and Vietnam, where you start at age 1.
  • Birthday Countdown Calculator
    Count down to your next birthday. Enter your birth month and day to see the exact days, hours, minutes, and seconds until you celebrate again.
  • Baby Age in Weeks and Months Calculator
    Find your baby's age in weeks, days and whole months from their date of birth. Quick, accurate infant age calculator for any "as of" date.
  • Average Age Calculator
    Calculate the average (mean) age of a group instantly. Enter each person's age, separated by commas, to get the mean, total, youngest and oldest.
  • 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.
  • 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.

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