Date of birth calculator
Everything about your age starts from one fact: your date of birth. Enter it below and this calculator turns it into your exact age in years, months and days, the day of the week you were born on, your total days lived, and your next birthday — all counted on the real calendar.
🔒 100% private: the dates you enter never leave your device. All calculations happen in your browser — nothing is uploaded, stored, or seen by us.
What your date of birth reveals
- Your exact age — complete years, then complete months since your last birthday, then remaining days.
- The weekday you were born on — shown right under your age, for every birth date, leap years included.
- Total days lived — your life as a single day count, plus total months, weeks and hours.
- Your next birthday — its date and weekday, the days until it, and the age you will turn.
How the calculation stays exact
The calculator subtracts the two dates on the real calendar rather than dividing by 365, so leap days never throw it off — that is why the day-of-week result is reliable even for birthdays decades ago. Our guide to how to calculate age walks through the method, and what chronological age means explains why the calendar figure is the one official forms ask for.
Age on any date, not just today
Set the "Age at date" field to a past or future date — a cutoff, an anniversary, a milestone year — and the whole result, including the next-birthday line, is re-worked for that day.
Frequently asked questions
What day of the week was I born on?
Enter your date of birth above and the result line states the weekday you were born on, for example "Born on Tuesday, June 15, 1995".
How many days have I lived?
The results show your total days lived, counted day by day on the real calendar, including every 29 February since your birth.
What is my exact age from my date of birth?
It is the complete years since your birth, plus the complete months since your last birthday, plus the remaining days — all shown by the calculator above.
Can I find my age on a specific date from my date of birth?
Yes. Set the "Age at date" field to that date and the calculator shows your age on that day.
Is my date of birth private?
Completely. The calculator runs in your browser; the dates you enter are never uploaded or stored anywhere.
Looking for the general calculator? It is on the AgeCalc home page →