Pick your date of birth and watch your life stats update live. Private, instant and free.
That date doesn't look right. Check that your date of birth is a valid date and comes before the reference date.
Seconds and heartbeats tick in real time
ChronoAge helps you work out the calendar age between a date of birth and a date you choose. Use it for a quick age check, birthday planning, or to understand how old someone was on a past or future date. For official applications, always follow the organisation's own rules for calculating age and eligibility.
Suppose a person was born on 15 March 2000 and the reference date is 10 October 2026. Their calendar age is 26 years, 6 months and 25 days. The calculator counts completed calendar years and months first, then the remaining days; it does not treat every year as exactly 365 days.
Why calendar dates matter: Months have different lengths, and leap years add an extra day to February. A calendar-based calculation accounts for these differences when working out the years, months and days between two dates.
The custom-date option can help you check an age as of a school admission date, an exam cutoff, an application deadline, or another date in the past or future. Enter the date specified by the relevant organisation. Eligibility rules can differ, so use this result as a calculation aid rather than a substitute for the official rules.
The age calculation is performed in your browser. The date you enter is used by the page's calculator code to produce the result; this statement does not cover data handled by your browser, hosting provider, or third-party services such as advertising. For a precise official age determination, check the applicable local rules and the date format requested on the form.
Curious why the same person can have different ages in different countries? Read how age is calculated, and why Korean age is different. Checking eligibility for an exam or job? See how to calculate your age "as on" a date. Born on 29 February? Read leap day birthdays explained.
Your birth date is calculated in your browser and isn't sent to our servers.
Leap years and month lengths are handled precisely, including February 29 birthdays.
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An age calculator works out your exact age from your date of birth, in years, months and days. ChronoAge also shows extra details such as days lived, your next birthday and your zodiac sign.
It compares your date of birth with today's date using real calendar math, counting full years first, then full months, then remaining days. Month lengths and leap years are respected, so the breakdown is always calendar-accurate rather than an approximation based on 365-day years.
The age calculation runs locally in your browser, and this calculator code does not send your date of birth to a ChronoAge calculation server. Your browser, hosting provider, and third-party services such as advertising may process data under their own policies; see the Privacy Policy for details.
Yes. Because the calculator works with actual calendar dates, leap years are handled automatically. If you were born on February 29, your age is still computed correctly in non-leap years, and the birthday countdown treats 1 March as your birthday in those years.
It multiplies your total minutes lived by an average resting heart rate of 70 beats per minute. It's a fun approximation. Real heart rates vary by age, fitness, and activity, so treat it as entertainment, not medical data.
In "Age as of today" mode, those stats tick in real time. The page recalculates them every second from your birth moment. If you switch to "Age on a specific date," the totals are shown as a fixed snapshot for that date instead, since a past or future date shouldn't keep counting up.
Of course. Enter any past date of birth and you'll get the same full breakdown: exact age, day of the week they were born, zodiac sign, and birthday countdown.
Yes. Switch to "Age on a specific date" above the calculator and enter the cutoff date instead of today's date. This works for exam eligibility, visa or passport applications, retirement planning, or any form that asks for your age "as on" a particular date. The breakdown, birthday countdown, and totals all update to reflect that date instead of today.