Does this account for leap years?

Yes, the calculation uses actual calendar dates, so leap years are automatically handled.

Age Calculator

Enter your date of birth to calculate your exact age as of today (or another chosen date).

Inputs

Results

Try an example

Formula

Age = As Of Date − Date of Birth, broken into years/months/days

How Date and Time Calculations Actually Work

Why calculating someone's age isn't just subtraction, and how business day and leap year calculations handle real calendar quirks.

Why Calculating Someone's Exact Age Isn't Just Subtraction

The date-arithmetic logic behind calculating exact age in years, months, and days, with a real example.

How Pregnancy Due Dates Are Calculated (Naegele's Rule)

The 280-day rule behind due date estimates, and why only a small fraction of babies arrive exactly on that date.

Tracking a Pregnancy Timeline: Due Dates, Weeks, and What the Numbers Mean

How due date calculations and weeks-pregnant tracking work together, and why early estimates often get refined later.

Date Difference Calculator

Calculate the number of days, weeks, and months between two dates.

Countdown Calculator

Calculate the time remaining until a future date and time.

Day of the Week Calculator

Find out what day of the week any date falls on.

Time Duration Calculator

Calculate the duration between two clock times in hours and minutes.

Leap Year Checker

Check whether a given year is a leap year.

Week Number Calculator

Find the ISO week number for any date.