Age Calculator
Enter a date of birth to see exact age in years, months, and days, plus a countdown to the next birthday.
Pick a date in the past.
Enter a date of birth
Choose your birth date and the result will appear here.
How this works
The age calculator subtracts the date of birth from today and breaks the result down into years, months, and days using calendar logic. It also computes the total number of days lived and the number of days remaining until the next birthday.
Age by birth year
Frequently asked questions
How is age calculated?
The age is computed using calendar arithmetic, so the years, months, and days reflect the actual time between your birth date and today.
Can I calculate age in days?
Yes. The result includes total days lived. You can also use our dedicated Age in Days calculator.
Does the calculator account for leap years?
Yes. The calculator uses real calendar arithmetic, so leap years are handled automatically.
Does the result update each day?
Yes. The calculator uses your current local date, so if you check tomorrow the days value will increase by one.
What if my birthday is today?
Happy birthday! The countdown to your next birthday will show 365 days (or 366 in a leap year).