Calculate age in years, months, and days from a date of birth. You can also ask “how old on this date,” see total days lived, and how many days remain until the next birthday.
Age calculator
Enter a date of birth to get age in years, months, and days — plus total days lived and days until the next birthday. Defaults to today; change the second date for “how old on this date.”
36 years, 2 months, 8 days
13,218 days lived
Next birthday: 2027-06-15 (296 days)
Uses calendar dates, not time of day. Leap-day birthdays are treated as the last day of February in non-leap years, which matches how most civil calendars handle 29 February.
How to use Age calculator
- Enter the date of birth.
- Leave the second date as today, or pick another date.
- Read years/months/days, total days, and the next birthday.
Example: Born 15 June 1990, on 15 June 2026 you are exactly 36 years, 0 months, 0 days.
Frequently asked questions
- How are months and leftover days counted?
- Years and months use the calendar (same day-of-month when possible). If the day has not occurred yet this month, the leftover days come from the previous month’s length.
- What happens with a 29 February birthday?
- In non-leap years the birthday is treated as 28 February, which is how most civil systems handle leap-day births.
- Does this include the time of day?
- No. It uses calendar dates only, so someone born this morning and someone born this evening are the same age today.