Age Calculator
Calculate exact age in years, months, and days from a birth date. Also shows total days, total weeks, total months, and next birthday countdown.
Results
| Age | 36 years, 1 months, 18 days |
| Total Days | 13,198 |
| Total Weeks | 1,885 |
| Total Months | 433 |
| Total Hours | 316,752 |
| Total Minutes | 19,005,120 |
Next Birthday
Formula
How Age Calculation Works
Age calculation seems simple, but precise computation requires handling varying month lengths, leap years, and timezone differences. This calculator uses calendar-based arithmetic for exact results.
Years, months, and days: The most natural way to express age. A person born on January 15, 1990, is 36 years, 1 month, and 18 days old on March 5, 2026. The calculation follows calendar conventions — each month is counted as it appears on the calendar.
Leap year handling: February 29 birthdays are handled by counting to February 28 (or March 1) in non-leap years. The calculator correctly handles this edge case.
Next birthday: The calculator shows how many days until your next birthday, which can be useful for planning celebrations or tracking milestones.
Accuracy & Verification
- Verification Source
- International Organization for Standardization (ISO 8601)
- Last Verified
- 2026-01-10
All calculations happen on your device. Your data never leaves your browser.