Age Calculator
Enter a date of birth and get the exact age in years, months and days — plus a birthday countdown.
How to use
- Enter the date of birth.
- Optionally change the “as of” date — it defaults to today.
- Read the exact age, total days lived, and how many days remain until the next birthday.
Examples
Exact age today
Born 1990-05-15? As of 2026-08-16 that is 36 years, 3 months and 1 day — 13,242 days in total.
Age on a specific date
Set “as of” to a form deadline or event date to know the exact age on that day — useful for applications with age limits.
FAQ
How is the age calculated?
Using the international convention: age increases by one on each birthday. Months and days are the calendar distance since the last birthday, so “36 years 3 months 1 day” means the 36th birthday has passed by 3 months and 1 day.
What about February 29 birthdays?
In years without a leap day, the age increases on February 28 — the last day of February — so a Feb 29 birth is exactly 1 year old on Feb 28 of the next (common) year. In leap years the real February 29 is used.
Can I calculate age at a past or future date?
Yes — change the “as of” date. The only restriction is that it cannot be before the date of birth.
Why does the result differ from some other calculators by a day?
Tools differ in whether they count the birth day itself. This calculator says you are exactly N years old on your Nth birthday, which is the standard legal interpretation.