About this tool
The age calculator turns a birth date into your exact age, split into full years, remaining months, and remaining days, alongside the total number of days you have lived and a countdown to your next birthday. Everything is worked out in your browser from your device's current date, with no uploads, no accounts, and no tracking.
The breakdown uses calendar-accurate arithmetic rather than fixed 30-day months: it counts complete years and months, then borrows the previous month's real length when today's day-of-month falls before your birth day, so differing month lengths and leap years stay correct. Total days lived is measured between your birth date and today at local midnight, and the next-birthday figure counts forward to the next occurrence of your birth month and day.
Results refresh live as you edit the date, and the page keeps working offline once loaded. It is handy for filling in forms, checking age-eligibility thresholds, or tracking milestones without handing a birth date to any server.