Calendar years first
The calculator advances complete years and months before counting the leftover days.
Count the age without
borrowing a calendar.
Find an exact age on any date, see total days and weeks, and check how long remains until the next birthday.
Dates stay in this browser tab. Birth dates are not uploaded, logged, or remembered.
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Choose the two dates
Age uses calendar years and months, not an average number of days per year.
For official forms, eligibility, benefits, or legal deadlines, follow the date and age rule used by the responsible organization.
Calendar math done properly01 02 03
Age is more than days divided by 365.
Leap years are included
Total-day calculations use real calendar dates, including every February 29 inside the range.
Any comparison date works
Use today, a past application date, or a future milestone without changing the system clock.
Age-calculator questions.
How are years, months, and days calculated?
The tool counts complete calendar years, then complete calendar months, then the remaining calendar days.
What happens with a February 29 birthday?
The next-birthday display uses February 28 in non-leap years as a practical convention. Official rules can differ.
Why are total weeks rounded down?
Only complete seven-day weeks are shown. Total days provides the exact elapsed calendar-day count.
Are birth dates saved?
No. They stay in the current tab and are not stored in local browser preferences.