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Age Calculator
Enter a date of birth to see the exact age in years, months and days, along with the total days lived and the number of days until the next birthday.
How age is calculated
Age is counted from your date of birth to the date you choose, which defaults to today. The result is given in complete years, then months and days. When a day or month is negative, the calculator borrows from the previous month so the count matches the calendar.
You can also change the "as of" date to work out someone's age on a specific day, such as an exam, a school admission cut-off or a policy start date.
Frequently asked questions
Can I calculate someone else's age?
Yes. Enter their date of birth and the date you want to measure against, such as a cut-off date for an exam or job.
What happens to people born on 29 February?
In non-leap years, this calculator counts their birthday as 1 March, which is how calendars roll the date forward.