Age Calculator
Everyday
Enter a birth date and an optional as-of date to get the precise age in years, months and days. The tool also shows total days lived, the day of the week you were born, and how many days until your next birthday.
Age
26 yr 5 mo 1 d
- Total days
- 9,649
- Total weeks
- 1,378
- Total hours
- 231,576
- Born on a
- Saturday
Next birthday
2027-01-01(213 days to go)
How to use
- Pick your birth date.
- Leave 'as of' set to today, or change it for any other date.
- Read your age and total days lived.
- See the date and countdown to your next birthday.
Frequently asked questions
- How is age calculated?
- Calendar-accurate: full years, then full remaining months, then leftover days, exactly the way a passport or hospital form computes age.
- Does it handle leap years?
- Yes — the calculation walks calendar months, so February 29 birthdays and leap day arithmetic come out correctly.
- Can I see how old someone was on a past date?
- Yes — change the 'as of' date to any date after the birth date.
- Why no time-of-day?
- Birth times are rarely entered consistently, so the tool works on whole days and treats both dates in your local timezone.
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