About the age calculator
Your exact age counts full years, then the extra months and days since your last birthday. The calculator uses calendar months, so it matches how age is normally stated on forms. Change the second date to find someone's age on a past or future day, for example on a school cutoff date.
Formula
Age = difference between the two dates in complete years, months and days. Total days = end date − birth date.
Frequently asked questions
How do I calculate my age in days?
Subtract your birth date from today's date. The "Total days" line shows the result.
What if I was born on February 29?
In non-leap years most places treat your birthday as either February 28 or March 1. This calculator counts it as March 1.