Age Calculator

We subtract the birth date from the reference date, adjusting years and months whenever the day of the reference month is smaller than the birth day, to arrive at complete years, months and days.

Yes. Use the 'Calculate as of' field to find out how many years, months and days someone had (or will have) on any date.

Because the calculation accounts for leap years and the actual length of each month, so the total days lived is more accurate than a simple multiplication.

We take the birth day and month and apply them to the current year; if that date has already passed, we use the following year, and show how many days remain until then.

The calculator counts completed years from your birth date to today, then the remaining months and days. It accounts for leap years and for months of different lengths, which a simple day-count division gets wrong.

The result includes your total age in days as well as in years, months and days, so you can use whichever figure you need.

Subtracting birth year from current year ignores whether your birthday has already happened this year. This calculator compares the full date, so it shows your real age today.

Yes. Change the reference date to any day and the calculator returns the age at that moment, which is useful for eligibility, retirement or school-entry dates.