Age in years, months, and days
Get a calendar-based chronological age instead of a rounded decimal estimate.
Date of birth calculator
Exact Age Calculator
Enter a date of birth to calculate exact age in years, months, and days—today or on any specific date.
Your dates are calculated locally in your browser and are never uploaded.
How to calculate age
Find age from date of birth in three steps
- 01
Enter the birth date
Select the complete date of birth, including day, month, and year.
- 02
Choose a reference date
Keep today selected or choose a past or future date for an age-at-date calculation.
- 03
Read the exact result
See full years, remaining months and days, total time lived, and the next birthday.
More than a year count
What this date of birth age calculator shows
Age on a specific date
Check an age for an application deadline, school cutoff, anniversary, or future event.
Next birthday countdown
See the next birthday date, the age reached, and how many days remain.
Total time lived
View total completed months and weeks plus the exact number of elapsed calendar days.
Calendar-aware calculation
How exact age is calculated
The calculator counts completed calendar years first, then completed calendar months, then the remaining days. It uses the real length of each month and calculates dates in a stable day-only format, so daylight-saving changes cannot shift the answer.
Leap years and February 29
For a February 29 birth date, the anniversary is treated as February 28 in a non-leap year. Results may differ where a law or organization applies another official rule.
How do I calculate my exact age from my date of birth?
Enter your date of birth and use today as the reference date. The result shows completed years, completed months after the last birthday, and the remaining days.
Can I calculate age on a specific date?
Yes. Change the “Age on this date” field to any past or future date that is not earlier than the birth date.
Does the calculator include leap years?
Yes. Total days and calendar age use actual month lengths and leap years. February 29 anniversaries use February 28 in non-leap years.
What is chronological age?
Chronological age is the elapsed calendar time since birth, commonly written as completed years, months, and days.
Is this an official legal age result?
The result is a general calendar calculation. For legal, medical, school, or benefits decisions, follow the rules of the relevant authority.