How to use the age calculator
- Click the date field and pick your date of birth from the calendar.
- Click "Calculate Age".
- Read your exact age in years, months and days.
- See the total number of days you have lived.
How the age is calculated
The calculator counts complete years, months and days between your birth date and today, adjusting for months of different lengths and for leap years. It also shows the total number of days lived, which is useful when filling in forms or simply for curiosity.
Why use an age calculator?
Some applications, competitions and registrations ask for your age in years, months and days rather than just years. A day-by-day figure is also used in some cultures for birthdays and anniversaries. Calculating it by hand is fiddly because of leap years and varying month lengths — this tool does the arithmetic instantly.
Tips for accurate results
Make sure you pick the correct year, especially if you were born near the start or end of a year. The tool uses your device's current date and local time zone, so the result reflects today's date where you are.
What counts as a leap year?
A leap year happens every four years, when February has 29 days instead of 28 — with a few century exceptions. The calculator accounts for these automatically when working out your age and total days lived, so you do not have to count leap days by hand.
Age in years, months and days explained
The result is expressed as complete units. If you were born on the 15th of a month and today is the 12th, the days figure is the difference adjusted across the previous month's length, not a simple subtraction. This is why the months and days can shift slightly compared with a quick mental estimate.
Using your age for official purposes
Some forms, visa applications and school admissions require an exact age rather than a rounded number of years. This tool gives you the precise figure in seconds, including the total days lived, which some applications and calculators specifically request.