Free Age Calculator (Years, Months, Days & Next Birthday)

Calculate exact age in years, months, weeks, days, hours, and minutes from Date of Birth. Includes countdown to your next upcoming birthday.

🔒 100% In-Browser & Zero Server Uploads

About Age & Date of Birth Calculator

Calculates chronological age between date of birth and any target date with leap year accuracy, total days lived, and next birthday day-of-week tracker.

How to Use Age & Date of Birth Calculator Online

  1. Select your Date of Birth.
  2. Optionally select a target calculation date (defaults to today).
  3. View exact age in years, months, days, total hours, and upcoming birthday countdown.

Frequently Asked Questions

How does the calculator handle leap day births (February 29)?
Correctly recognizes leap years and calculates non-leap year anniversaries as March 1.