Do not divide total days by 365
Calendar age must account for different month lengths and leap years, so years, months and days are calculated on the calendar.
Date & time
Age calculator
Calculate an exact age in years, months and days.
Clear and dependable
How to use this calculator
Enter the date of birth and the date on which to calculate age. The calendar engine returns complete years, months and remaining days.
Understanding the result
The main result is the exact calendar age in years, months and days. The detail line also reports total months, weeks, days and the countdown to the next birthday.
Avoid these errors
Common mistakes
The calculation date matters
Age changes on the birthday, and February 29 birthdays require explicit calendar handling in non-leap years.
Common questions
Are intermediate values rounded?
No. Full practical precision is retained during calculation and rounding is applied only to the displayed values.