Age Calculator
Calculate your exact age in years, months, days, and more
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years old
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Total months
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Total days
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Total hours
Day of the week born
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Next birthday
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Exact breakdown
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Weeks lived
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What is an Age Calculator?
An age calculator computes how much time has passed between two dates — typically from a birth date to today. The most common use is finding your exact age, but you can also use it to calculate someone's age at a historical date, see how many days until a birthday, or find out what day of the week you were born on.
This calculator shows your age in years, months, and days (the exact breakdown), plus total months, total days, and total hours lived. It also tells you your next birthday and how many days away it is.
How to Use This Calculator
- Select your date of birth from the first date picker.
- The "Age at Date" field defaults to today. Leave it as-is to get your current age, or change it to any date to calculate age at a specific point in time.
- Your exact age appears instantly below, along with additional details.
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Frequently Asked Questions
Enter your date of birth and this tool shows your total days lived in the stats below the main age display. The calculation subtracts your birth date from today and counts every calendar day in between, accounting for leap years. For most adults, this is a 5 to 6-digit number that often surprises people.
Enter your birth date and the "Day of the week born" card shows you the answer immediately. The calculation uses the Gregorian calendar and correctly handles dates before and after 1970 (the Unix epoch). This is a popular fact to know for astrological charts and personal records.
Enter your birth date and the "Next birthday" card shows exactly how many days remain until your next birthday. If your birthday has already passed this year, it counts down to next year's occurrence. If it's today, the tool will show a happy birthday message.
Yes. Change the "Age at Date" field to any date you want — past or future. For example, entering someone's birth date and the date of a historical event will tell you how old they were on that day. This is useful for research, genealogy, and historical questions.
Leap years are fully accounted for. A leap year occurs every 4 years (divisible by 4), except for century years, which must be divisible by 400. The total days calculation counts each calendar day precisely, meaning years with 366 days are treated correctly. For people born on February 29, the birthday is counted on March 1 in non-leap years.