🎂 Age Calculator
How It Works
Calculate your exact age in years, months, and days from your birth date to today. Use Age Calculator to answer a specific calendar or time question from the dates or times you enter.
The result is most useful when the inputs match the definitions used by this calculator. For this tool, the underlying method is: Age is calculated by comparing the birth date with the current date, accounting for leap years.. Compare the output with the worked example, then change one meaningful input at a time to see how the result responds.
What Is Age?
An age calculation compares a birth date with a reference date using calendar rules. Months have different lengths and leap years add an extra day, so calendar age is not simply days divided by 365.
How to interpret the result: Compare the output with the worked example and with another scenario using the same definitions. For this calculator, the key relationship is Age is calculated by comparing the birth date with the current date, accounting for leap years..
How to Calculate Age
The page uses the method shown in the Formula section: Age is calculated by comparing the birth date with the current date, accounting for leap years.. Keep the inputs in matching units, then change one meaningful input at a time when testing scenarios.
Important limitation: For official deadlines, legal eligibility, travel, or other high-stakes uses, verify the applicable rule and date convention. Review the age inputs and units before relying on the result.
Exact age as of a date
Calendar age is determined by comparing the birth date with a reference date. Years, months, and days cannot be calculated reliably by simply dividing total days by 365 because month lengths and leap years vary.
Age for forms and eligibility
Many applications use an age cutoff date rather than today's date. Enter the relevant reference date when a form, exam, visa, or policy specifies one.
Leap years and birthdays
Calendar-aware age calculations handle February 29 and different month lengths instead of assuming every year or month has the same number of days.
When to Use This Calculator
Use Age Calculator to answer a specific calendar or time question from the dates or times you enter.
Practical tip: For this Age Calculator, confirm the reference date, time zone, and counting convention before comparing scenarios or using the result for an important deadline.
Formula
Age is calculated by comparing the birth date with the current date, accounting for leap years.
Example
If you were born on January 15, 1990, and today is August 13, 2026, you are 36 years, 6 months, and 29 days old. Use the calculator to test a second scenario and see how the result changes when one important assumption is adjusted.