Age Calculator
Your age, down to the day
Your Age
30You'll turn 30 on Friday, 15 March 2030.
- 1Enter your birthdateSelect your date of birth
- 2Choose a datePick a date (or use today)
- 3Get your ageSee your age in years, months and days
How is your age calculated?
We compare your birthdate with the selected date and count completed years, then months, then the days left over.
Age = selected year − birth year
Subtract 1 if your birthday has not happened yet
How many days have you lived?
We count every calendar day between the two dates, so leap days (29 February) are included automatically. Weeks, hours and minutes are worked out from that day count.
Why months can look uneven
Months have 28 to 31 days, so we count whole months first. If you were born on the 31st, a month later lands on the last day of a shorter month, and the leftover is shown as days.
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Frequently asked questions
Can I calculate my age on a future date?
Yes. Change “Age on this date” to any future date, or type any year under “Your age in” to see how old you'll be that year.
Does this calculator include leap years?
Yes. It counts real calendar days, so every 29 February between the two dates is included.
How do I find the days until my birthday?
Enter your birthdate. The result panel shows the date of your next birthday and how many days are left.
I was born on 29 February. When is my birthday in other years?
In years without a 29 February, this calculator treats 28 February as your birthday.
How do I calculate my age as on a specific date, for an exam form?
Enter your date of birth, then set “Age on this date” to the cut-off date in the notification, such as 1 August 2026. You get your exact age in years, months and days on that date.
Last reviewed: October 2026