Find your exact age in years, months, and days from your date of birth — plus total days lived and your next birthday.
This calculator finds the calendar-accurate difference between your date of birth and a reference date (today, by default) — broken down into complete years, months, and days, the same way a birthday would actually be counted.
It also shows your total days lived, total weeks and months, the day of the week you were born, and a countdown to your next birthday. You can change the "Calculate Age On" date to find out how old you were on a specific past date, or how old you'll be on a future one.
Your exact age is calculated by comparing your date of birth to today's date using the calendar (Gregorian) system, giving you a calendar-accurate breakdown in complete years, months, and days rather than an estimate.
Yes. In the most commonly used age system, your age increases by one on your birthday. For example, someone who has lived 3 years and 11 months is still considered 3 years old until their next birthday.
Yes. This calculator lets you set any reference date instead of today, so you can find out how old someone was, or will be, on a specific past or future date.
This calculator shows your total days lived alongside your years/months/days breakdown, calculated as the exact number of days between your date of birth and the reference date.
No. All calculations happen directly in your browser — your date of birth is never sent to a server or saved anywhere.