An age calculator is a free online tool that computes your exact age from your date of birth. Enter your birthdate to see your age in years, months and days, plus total days alive, the day of the week you were born, and a countdown to your next birthday, with no signup.
Calculate your age
How do you calculate exact age from a birthdate?
Subtract the birth year from the current year, then adjust: if this year's birthday has not happened yet, subtract one year. Count the remaining whole months and leftover days with calendar borrowing, so someone born March 10 is exactly 30 years, 6 months and 24 days old on October 4.
This borrow-and-carry method is what official documents use, and it is exactly what the calculator above applies. Total days alive is simpler: it is the raw day count between the two dates, including leap days.
Why does age in months and days matter?
Pediatricians track infant development in months, insurers and pension plans use precise age bands, and milestone birthdays need the exact day. Years alone can be off by almost twelve months, which matters for eligibility cutoffs and legal age thresholds. The calculator above gives you all three units instantly.
School enrollment, sports age groups, driving licenses and retirement benefits all hinge on whether a birthday has passed, so the months-and-days breakdown removes the guesswork.
How do leap years affect age calculation?
Leap years add a February 29 every four years (skipping most century years), and real calendar math counts those days automatically. Someone born on February 29, 2000 is exactly 26 on February 29, 2026, and their age stays correct in every other year too.
The calculator handles this natively by comparing true calendar dates rather than multiplying by 365, so Feb 29 birthdays and century-year exceptions are all correct.
How can I find what day of the week I was born on?
Enter your birthdate above and the tool shows the weekday instantly, for example "Born June 15, 1995 (Thursday)". It uses the same calendar math behind the exact-age result, so it works for any date your browser supports, past or present.
People use this for birthday trivia, genealogy research and planning milestone parties on the matching weekday.
FAQs
Is this age calculator free?
Yes. Calculate ages as often as you like with no account, no watermark and no limits.
How is exact age in years, months and days calculated?
Full years are counted first, then the remaining whole months, then the leftover days, borrowing from the previous month when needed so the result matches calendar age.
Does it account for leap years?
Yes. The calculator uses real calendar dates, so February 29 birthdays and leap days are handled correctly in every total.
What if I was born on February 29?
Your birthday is counted on February 28 in non-leap years for the countdown, and your exact age still uses true calendar math.
Is my birthdate stored anywhere?
No. The date you enter is processed in your browser and never sent to any server.