Age Calculator
Calculate your exact age in years, months, and days. This tool also shows total days lived, total months, and how many days remain until your next birthday.
Your Exact Age
How the Age Calculator Works
The age calculator determines the difference between two dates — your date of birth and today's date (or any chosen date). It returns your exact age in:
- Years
- Months
- Days
- Total days lived
- Total months lived
- Days until next birthday
Age Calculation Formula
1. Age in years:
Years = Today.year − Birth.year
2. Age in months (remaining):
Months = Today.month − Birth.month
3. Age in days (remaining):
Days = Today.day − Birth.day
If days or months become negative, we borrow from next higher unit.
Total Days Lived:
Total Days = Difference(Today, Birth) in days
Next Birthday:
Next Birthday = Birthdate in current year or next year − Today
Example
Date of Birth: 10 January 1995
Today: 25 February 2025
- Years = 30
- Months = 1
- Days = 15
- Total days lived ≈ 11,000+
- Next birthday in: 10 months 15 days
Input Rules & Validations
- Date of birth must be earlier than today’s date.
- Birth year should be between 1900 and the current year.
- Future dates are not allowed for DOB.
- The tool supports leap years and month length variations.