Age Calculator
Enter a birth date and instantly see the exact age in years, months, and days, plus total days lived, the weekday you were born, your zodiac sign, and how long until your next birthday.
Enter your birth date
Choose a birth date to see the result.
Exact Age
Enter your birth date
Days Lived
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Next Birthday
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Time Details
How to calculate your exact age
Pick a date of birth, and change the as-of date if you need your age on a specific day.
- 01
Pick the date of birth
The result appears as soon as you choose it, with no button to press.
- 02
Change the "as of" date if a form asks for it
It's today's date to start with. Exams, visas and school admissions often ask for age on a cut-off date, such as 1 August, so set that date instead.
- 03
Read the exact age and the extras
You get years, months and days, plus total days and weeks lived, the weekday you were born, your Western zodiac sign and how many days remain until your next birthday.
How exact age is counted
Age in years, months and days is counted the way you'd do it on a calendar. Take someone born on 15 March 1990, with an as-of date of 31 October 2026. From 15 March 1990 to 15 March 2026 is 36 full years. From 15 March to 15 October is 7 more months. From 15 October to 31 October is 16 days. So the age is 36 years, 7 months and 16 days, and they've lived 13,379 days, or 1,911 weeks. They were born on a Thursday.
When the as-of day is earlier in the month than the birth day, the calculator borrows the length of the previous month. For a birth on the 20th and an as-of date of 5 May, it counts from 20 April: 30 days in April minus 20, plus 5, gives 15 days. That's why ages near month-ends can look a day different from a quick mental estimate.
Age on a cut-off date
Eligibility rules usually set an age limit "as on" a date, and being a single day short counts. Say an exam requires candidates to be under 22 on 1 August 2026. Someone born on 2 August 2004 is 21 years, 11 months and 30 days old on that date, so they qualify. Someone born on 1 August 2004 turns 22 that day and doesn't.
Set the as-of date to the cut-off, check the years figure, and read the exact wording of the rule. "Under 22" and "not more than 22" give different answers for the person born on 1 August.
Edge cases worth knowing
- Leap-day birthdays: someone born on 29 February has their birthday counted as 28 February in non-leap years. Some laws use 1 March instead, so check the rule that applies to you.
- Time of birth isn't included. On your birthday you're counted a year older from midnight, whatever time you were born.
- Dates are read in your device's timezone. Someone born late at night abroad may find their birth certificate shows the next day in local time.
- Ages in other systems, such as the traditional Korean count, which South Korea dropped for official use in 2023, aren't calculated.
Totals worth knowing
The days-lived figure counts every calendar day, leap days included. A year averages 365.2425 days over the full Gregorian cycle, so 18 years from birth is usually 6,574 or 6,575 days depending on how many 29 Februaries fall in between. That's why age in days isn't simply years × 365.