Age Calculator

Find an exact age in years, months and days from a date of birth. See the total days lived, a countdown to the next birthday and the weekday you were born.

Age
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Total months–
Total weeks–
Total days–
Next birthday–

How the age calculator works

The calculator counts complete calendar years from your date of birth, then the complete months after that, and finally the remaining days. This matches how age is normally stated, so someone who has had their 36th birthday but not their 37th is 36 years old, however many months have passed since.

Worked example

Someone born on May 15, 1990, on October 24, 2026, is:

  • 36 years, 5 months and 9 days old
  • 437 months, or 13,311 days
  • 203 days away from their 37th birthday

Common uses

  • Checking age requirements for school, sports leagues, licenses or retirement plans.
  • Working out someone's age on a past date, such as when a photo was taken.
  • Planning milestone celebrations like a 10,000th-day party.
  • Filling in forms that ask for age in years and months.

Age in different cultures

Most countries count age from zero at birth, which is what this calculator uses. A few traditional systems count differently. For example, the traditional Korean age count started at one at birth, though South Korea adopted the international system for official use in 2023.

Need the time between any two dates instead? Use the date calculator.

Last reviewed October 2026.

Frequently asked questions

How is age calculated?

Age is counted in completed years, months and days from your date of birth. You turn one year older on your birthday, so someone born on May 15, 1990 is 36 years old from May 15, 2026 until the day before May 15, 2027.

How does the calculator handle February 29 birthdays?

In years without a February 29, the calculator treats March 1 as the birthday. Legal rules for leap-day birthdays can differ by country and purpose, so check if it matters for an official document.

Can I find my age on a future or past date?

Yes. Change the "Age on this date" field to any date, for example to check how old you will be at an event or how old someone was when something happened.

What day of the week was I born?

The calculator shows it below your age. It works for any date in the Gregorian calendar.

How many days old am I?

The total days figure counts every day from your birth date up to the chosen date. The weeks and months totals are shown too, which some people like to track for milestones such as 10,000 days old.