What Is an Age Calculator?
An age calculator computes your exact age in years, months, and days from your date of birth. It can also calculate the age difference between two dates, making it useful for legal age verification, milestone tracking, and planning.
How to Use This Age Calculator
- Select your date of birth using the date picker.
- Click Calculate to compute your age from the birth date to today.
- View your exact age in years, months, and days, along with the total number of days and weeks.
Key Concepts
Age calculation accounts for varying month lengths (28-31 days) and leap years (February 29). The calculation subtracts the birth date from the current date, handling month and day borrowing. Legal age may be calculated differently by jurisdiction—some count from the day before the birthday.
Age = Current Date − Birth Date
Frequently Asked Questions
How are leap year birthdays handled?
People born on February 29 legally age on March 1 in non-leap years in most jurisdictions. The calculator shows the precise elapsed time regardless of this convention.
Can I calculate age between two arbitrary dates?
This tool calculates the elapsed time from a birth date to today. To find the duration between two arbitrary dates, you would need to use this tool twice and compare the results, or use a dedicated date duration calculator.
Why does age in days vary by year?
Regular years have 365 days and leap years have 366. Additionally, months range from 28 to 31 days, so the number of days between two dates varies depending on which months are included.