Date & time · Exact age

Age calculator

Enter a birth date to get an exact age and a countdown to the next birthday.

Birth date

Current age
—
Years, months and days
Total days lived—
Next birthday in—

Rough sheet

step-by-step
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How age is calculated

This calculator works out your exact age by comparing your birth date to today's date (or any other date you choose), counting whole years, then whole months, then remaining days — the same way you'd count on a calendar rather than just dividing total days by 365. That approach handles leap years correctly, since it counts actual calendar months and days rather than assuming every year is exactly 365 days long.

Frequently asked questions

Yes, use the optional "as of" date field to calculate age at any point in time, not only the current date.

It finds the next occurrence of your birth month and day from the "as of" date and counts the days remaining.