Age Calculator — Find Your Exact Age in Years, Months & Days
Calculate your exact age from date of birth in years, months and days. Also calculates total days lived, weeks, and days until your next birthday. Free, instant, no signup.
Age Calculator Formula
Age calculation seems simple but requires careful handling of months with different numbers of days, leap years, and the exact day difference. The formula involves subtracting the birth date from the current date while accounting for calendar irregularities.
The most accurate method is to calculate year difference first, then adjust for months, and finally adjust for remaining days. This is exactly how our age calculator works.
How to Calculate Age Calculator Manually
- 1Note today's date and your date of birth (day, month, year).
- 2Subtract the birth year from current year to get approximate age in years.
- 3Check if your birthday has already passed this year. If not, subtract 1 from the year count.
- 4Calculate the remaining months by subtracting birth month from current month.
- 5Calculate the remaining days by subtracting birth day from current day, adjusting for month lengths.
Calculation Example
Date of Birth: March 15, 2000
Today: March 15, 2026
Years: 2026 − 2000 = 26 years
Months: 0 months (birthday is today)
Result: Exactly 26 years old 🎂
Date of Birth: August 10, 1995
Today: March 15, 2026
Result: 30 years, 7 months, 5 days
Total days lived: approximately 11,174 days