Age Calculator
Calculate your exact age in years, months, and days from your date of birth.
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How to use this calculator
Subtracts the birth date from the reference date to get the precise elapsed time in years, months, and days.
- 1
Enter your date of birth using the date picker.
- 2
The "Age as of" field defaults to today — change it to calculate age at any past or future date.
- 3
Your exact age in years, months, and days appears instantly along with total days lived.
Frequently asked questions
How does the age calculator work?
It subtracts your date of birth from the reference date, accounting for leap years and varying month lengths, to give your precise age.
Can I calculate age for a specific past or future date?
Yes — change the "Age as of" field to any date you want to calculate your age at.
Does the calculator account for leap years?
Yes. Leap years (February 29) are handled correctly throughout all calculations.
How age is calculated
Years, months, and days
Your age in everyday terms is the number of complete years since your birth. A more precise calculation breaks this down into years, remaining months, and remaining days — useful for legal documents, passport applications, and medical forms where exact age matters.
Why ages can be calculated differently across cultures
In most Western countries, age increases on your birthday. In some East Asian traditions (notably Korea), everyone is considered one year old at birth and gains a year on New Year's Day rather than their birthday. This calculator uses the international standard birthday-based method.
Learn more from an authoritative source:
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Calculate a future or past date by adding or subtracting a number of business days (Mon–Fri).
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Discover your age, the day you were born, days until your next birthday, and your zodiac sign.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →