Age Calculator

Find your exact age in years, months and days from your date of birth, plus total days and weeks lived and a countdown to your next birthday.

Reviewed by Dany, RightSums team · Updated

Runs in your browser. Free, no sign-up.

time-dates · Daily life · UK & US

Pick a date of birth and the calculator measures from it to today, or to any other date you choose. It shows your exact age in years, months and days, the total number of days you have been alive and that total in whole weeks. It also counts the days until your next birthday and tells you which day of the week it falls on. Leap years and months of different lengths are handled by working with real calendar dates. When the day of the month has not yet come round, it borrows the length of the previous month to get the days figure.

Accepted inputs

  • Date of birth

Outputs

  • Exact age in years, months and days
  • Days until next birthday
  • Weekday of next birthday
  • Total days lived
  • Total weeks lived

How to use the Age Calculator

  1. Choose your date of birth in the date picker.
  2. The calculator compares it with today's date on your device.
  3. It counts whole years, then whole months, then the days left over.
  4. Read your exact age, total days and weeks lived, and the days left until your next birthday.

Frequently asked questions

How do I calculate my exact age?

Count the whole years since your birth date, then the whole months, then the days left over. Someone born on 15 June 1995 was 31 years, 3 months and 9 days old on 24 September 2026. The calculator does this against today's date.

How many days old am I?

Enter your date of birth and the calculator shows your total days lived. Someone born on 1 January 2000 was 9,763 days old on 24 September 2026, which is 1,394 full weeks. Leap days are counted because it uses real calendar dates.

How many days until my birthday?

The calculator counts the days from today to your next birthday and names the weekday. On 24 September 2026, someone born on 15 June had 264 days to wait, and their 2027 birthday falls on a Tuesday. On the birthday itself it shows 0 days.

Does the age calculator handle leap years?

Yes. It works with real calendar dates, so 29 February and months of 28, 30 or 31 days are counted properly. When your birthday date has not come round yet this month, it uses the actual length of the previous month to work out the days.

Can I work out someone's age on a past or future date?

Yes. Fill in the "Age on" date and the calculator measures to that date instead of today, so you can check an age on a past or future date. For the plain gap between two dates in days, working days and weeks, use the days between dates calculator.

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