Personal date calculation
Age Calculator
Enter a birth date and an optional reference date to preview a detailed age breakdown.
Calculate an age
Enter a birth date and optionally choose a different reference date. Leave it empty to calculate the age today.
This age calculator compares a date of birth with today or another reference date. It returns a calendar-based age rather than dividing the total number of days by an average year.
How to calculate an exact age
- 1Enter the date of birth.
- 2Optionally select a reference date; otherwise, today is used.
- 3Calculate to see the exact calendar age and additional totals.
Common uses
- Checking an exact age on a particular date
- Calculating time until the next birthday
- Comparing age in years, weeks and days
- Confirming the weekday on which someone was born
What the age result includes
The main result shows complete years, remaining months and remaining days. It also includes total days, total weeks, the weekday of birth and the next birthday.
Leap years and months with different lengths are handled as calendar dates. For a February 29 birthday, the countdown uses February 28 in non-leap years.
Age calculator questions
Does the calculator use today's date automatically?
Yes. Leave the reference date empty and DateKit uses the current date in your browser.
Is age calculated from 365 days per year?
No. The exact age uses calendar years, months and days, so leap years and month lengths are respected.
Are birth dates stored?
No. The calculation runs locally in the browser and DateKit does not save the dates entered.
Keep calculating