How Old Am I Today?
Enter your date of birth to calculate exact calendar age, total days and weeks, birth weekday, and your next birthday countdown.
Written and checked by TheToolNet Editorial Team · Last reviewed: October 3, 2026 · Editorial method
Calculate your age today
How exact age is calculated
Age is not just the comparison year minus the birth year. The calculator first counts completed years, then completed calendar months, then remaining days. Total days are calculated separately from UTC-midnight dates so daylight-saving changes do not add or remove an hour.
Age in years versus total days
Calendar age respects varying month lengths. Total days is a continuous elapsed count that includes every leap day between the dates. That is why dividing total days by 365 does not always reproduce the displayed years, months, and days.
February 29 birthdays
The elapsed-age calculation handles leap days directly. For the next-birthday countdown only, this page displays February 28 during a non-leap year. Legal treatment and personal celebration dates may differ by jurisdiction or preference.
Frequently asked questions
Does my birth date leave the browser?
No. The calculation runs locally in your browser and the site does not submit the form to a server.
Can I calculate how old I was on a past date?
Yes. Set “Calculate age on” to any date on or after the date of birth.
Is this suitable for legal age deadlines?
Use it as a date check, not legal advice. Rules about when age is attained can vary by jurisdiction and purpose.