Age Calculator
Enter a date of birth to see the exact age in years, months and days, total days lived, and when the next birthday lands.
Enter a date of birth to calculate the age.
- Exact age
- Total days lived
- Total weeks lived
- Next birthday
- Day of the week born
How is the exact age calculated?
The calculator walks the calendar from the date of birth to the "as of" date, counting full years, then full months, then the remaining days — the same way people naturally describe age ("24 years, 3 months, 10 days"), accounting for different month lengths and leap years.
What happens if the birth date is February 29?
In non-leap years, the next birthday falls back to February 28 so the countdown always lands on a real date; in leap years it lands on February 29 as usual.
Is anything sent to a server?
No. Everything is computed locally in your browser with JavaScript — no dates are uploaded anywhere.