Enter the date of birth
Pick it in the calendar or type it.
Age calculator
Enter a date of birth and get the exact age in years, months and days, the days, weeks and hours lived, and how long until the next birthday.
- Free
- No sign-up
- Runs in your browser
100% private — the calculation is done in your browser and nothing is sent to any server.
Next step
Keep going with your result in another tool. Nothing is uploaded.
How it works
Choose the date to measure on
Today by default. Change it to know the age on any other date.
Read the age
Years, months and days, plus totals and the next birthday.
Exactly how old is that?
Age is more than a number of years. For a form you may need the exact age on a given date, for a child the age in months, for a curiosity how many days you have lived, and for a party how long until the next birthday. This calculator works out all of these from a date of birth, and you can measure the age on any date, not just today, which is useful to know how old someone will be at a future event or was at a past one.
How age is worked out
Age in years, months and days is a calendar difference. From the date of birth, whole years are counted up to the latest birthday, then whole months, then the remaining days. If the birthday has not yet happened this year, the age in years is one less. Months are counted with their real lengths, so the result does not depend on an average month.
Totals and other figures
The months, weeks, days and hours lived are shown as running totals, useful for baby milestones ("she is 30 weeks old"), records and celebrations ("10,000 days old" happens at around 27 years and 5 months). The weekday of birth is shown too, together with the next birthday: its date, how many days are left and the age that will be reached.
Leap-day birthdays
People born on 29 February have a real birthday only in leap years. In other years, the tool treats 28 February as the birthday, which is the more common convention, although in some places the law uses 1 March. Check the local rule if it matters for legal purposes.
Age on a given date
Change the second date to know how old someone was or will be on that day: the age required to enter a competition on a fixed date, at the end of a school year, on the day of an appointment or at a historic event. The calculation treats both as calendar dates, without time of day or time zone.
What it does not do
It is a calculation, not an identity check, and it does not adapt to traditional age-counting systems used in some cultures, in which a person is one year old at birth. To find the time between any two dates, not necessarily a birth date, use the date difference calculator.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth. The calculator shows your age in years, months and days as of today.
How do I find someone's age on a specific date?
Change the "Age on this date" field. The result is the age on that day.
How many days old am I?
The "Days lived" figure counts the days from the date of birth to the chosen date.
When is my next birthday?
It is shown with the date, how many days are left and the age you will turn.
What about birthdays on 29 February?
In years that are not leap years, 28 February is used as the birthday.
Is my date of birth sent anywhere?
No. The calculation is done in your browser.
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