Age Calculator
Enter a date of birth to calculate the elapsed age as of today, based on your device's local date.
How it works
The calculator compares the birth date with the current local calendar date and reports completed years, months, and days. Calendar conventions can differ for edge cases such as leap-day birthdays.
Age Calculator: guide and date details
An age calculator compares a date of birth with a selected reference date and expresses the elapsed time in calendar years, months, and days. It is useful for everyday age checks, anniversaries, and planning, but official eligibility can depend on local law and exact time of birth.
How age is calculated
Calendar age is not simply the number of days divided by 365. Leap years and month lengths matter. The result may also depend on how a system handles a birthday on February 29 in a non-leap year.
How to use it
- Enter the date of birth.
- Select the reference date if the tool supports it.
- Review the years, months, and days and verify unusual dates separately.
Frequently asked questions
Can I calculate age on a past date? Use that date as the reference date if supported. Is this an official eligibility check? No; verify legal, school, travel, or employment requirements with the relevant authority.