Exact calendar units
Years and months follow real anniversary dates, so month lengths and leap years are handled without approximations.
Age calculator
Find an exact age in calendar years, months, and days, plus lifetime days and the countdown to the next birthday.
30 years, 0 months, 0 days
Born on Thursday, August 15, 1996, a Thursday.
Total days10,957
Next birthdayAug 15, 2026
Birthday countdownToday
Calendar age advances by anniversaries first, then complete months, then remaining days. A February 29 birthday uses February 28 as its anniversary in non-leap years.
How it works
Calendar age, not an average
Any as-of date
Use today or choose a past or future date to calculate age at a milestone, event, or deadline.
Shareable inputs
Both dates remain in the URL after calculation, making the result easy to bookmark or send.