How to use
- Enter the date of birth.
- Keep Age on set to today, or choose another date, for example a deadline for an application.
- Read the age and the days until the next birthday.
Options explained
- Age on
- The date the age is calculated for. Useful for eligibility rules such as "must be 18 on 1 January".
Examples
School enrolment. Enter a child’s birth date and set Age on to 1 September to check eligibility.
Retirement planning. Enter your birth date to see the exact date of a future birthday and how many days remain.
Frequently asked questions
How is the age counted?
In completed years, months and days, the usual way to state age. Someone born on 10 March is still 35 on 9 March and turns 36 on 10 March.
What about birthdays on 29 February?
In common years the next birthday is shown as 28 February. Legal conventions differ — some countries use 1 March — so check the rule that applies to you.
Is the date of birth stored?
No. The calculation runs in your browser and nothing is saved or sent.
Privacy
This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.