How exact age is calculated
The calculator counts whole years from the date of birth, then whole months, then the remaining days. It works on calendar dates, so time zones and daylight saving do not change the result.
Leap-day birthdays
People born on 29 February have a birthday date only in leap years. In other years this tool uses 28 February as the next birthday. Legal conventions differ between countries, so check local rules if the exact date matters.
Your date is used only in your browser and is never sent anywhere. To count the days between any two dates, use the days between dates calculator.