Age calculator: exact age from date of birth
Enter a date of birth to see the exact age today, or on any other date you choose, in years, months and days. You also get the total days, weeks and months lived and how long it is until the next birthday.
Everything runs on your device. Nothing you add or type is sent to any server.
How to use it
- 01
Pick the date of birth in the first box.
- 02
The second box is set to today's date on your device. Change it to find the age on another date, for example the cut-off date in a job or exam form. Tap Today to reset it.
- 03
Read the age in years, months and days, the totals, and the date and weekday of the next birthday.
How the age is counted
Years are the birthdays that have passed. Months are the whole months since the last birthday, counted on the same day of the month you were born. If that day does not exist in a month, such as the 31st in a 30-day month, the last day of that month counts. Days are what is left after that.
Worked example: someone born on 15 August 1990 is 36 years, 2 months and 24 days old on 8 November 2026. That is 13,234 days, or 1,890 weeks and 4 days. Their next birthday is Sunday, 15 August 2027, 280 days later, when they turn 37.
Leap years are handled exactly: a year has 29 February when it divides by 4, except century years, which must divide by 400. So 2000 and 2024 had 29 February, but 1900 did not and 2100 will not.
Born on 29 February
Most years have no 29 February, so the calculator asks which day should count as the birthday in those years: 28 February or 1 March. In those years it decides the day the age goes up and the countdown to the next birthday. With 1 March, months and days in that year are also counted from the 1st instead of the 29th. Total days and weeks stay the same. If you need an age for an official form, follow the rule the form or authority states.
Private by design
Today's date comes from your own device's clock and time zone. Nothing you enter is sent anywhere or saved; the calculation happens in your browser.
Frequently asked questions
Why could another calculator show a different number of days?
Calculators differ in how they count part months, especially for birthdays on the 29th, 30th or 31st. This one keeps the birth day of the month and uses the last day of shorter months. The totals of days and weeks are exact and do not depend on this.
Can I find my age on a past or future date?
Yes. Change the second date to any day on or after the date of birth, such as the last date of an application.
Does the time of birth matter?
No. The calculator works with whole calendar dates, so the age changes at the start of the birthday on your device.