Age Calculator
Enter your date of birth to get your exact age in years, months and days — calculated correctly across leap years and month boundaries. You will also see how many days you have lived, which weekday you were born on, a countdown to your next birthday, and even your half-birthday date.
Frequently Asked Questions
How is the exact age calculated?
The calculator subtracts your birth date from today's date, borrowing days and months like a calendar does. It correctly handles months of different lengths and leap years, so someone born on February 29 gets an accurate age every year.
What is a half-birthday?
Your half-birthday falls exactly six months after (or before) your birthday — a fun extra occasion to celebrate. This tool always shows your next upcoming half-birthday.
Why does my total days lived differ from other calculators?
Small differences usually come from time zones or from counting the birth day itself. This calculator counts whole calendar days between your birth date and today, exclusive of today, using UTC dates to avoid daylight-saving quirks.
Is my date of birth stored anywhere?
No. The calculation runs entirely in your browser. Your birth date is never sent to a server or saved.