Age Calculator
Calculate age, date differences, and countdowns with leap year accuracy
Date Information
Results
Detailed Breakdown
Time Units
Additional Information
Zodiac Information
Western Zodiac
Chinese Zodiac
About Age Calculation
Age calculation involves determining the time difference between two dates, typically from a birth date to a target date. Accurate age calculation accounts for leap years, which add an extra day to February every four years.
The algorithm for calculating age precisely:
- Calculate the difference in years
- Adjust for months that haven't occurred yet in the current year
- Adjust for days that haven't occurred yet in the current month
- Account for leap years in the calculation
A leap year occurs every year that is divisible by 4, except for end-of-century years, which must be divisible by 400. This means that the year 2000 was a leap year, but 1900 was not.
Our calculator also provides information about zodiac signs, both Western (based on birth date) and Chinese (based on birth year).
Understanding precise age calculation is important for many applications including legal requirements, health assessments, and milestone celebrations.