About this age calculator
This free age calculator works out the exact difference between your date of birth and any date you choose. It is handy for filling in forms that ask for age in years and months, for working out how many days old you are, for milestone birthdays, and for planning a countdown to a special date. All calculations happen locally in your browser, so your birthday is never uploaded anywhere.
Frequently asked questions
- How do I calculate my exact age?
- Enter your date of birth and the “age at” date (today by default). Your age in years, months and days appears instantly.
- How many days old am I?
- The tool shows total days lived along with weeks, months and hours.
- How is the next-birthday countdown worked out?
- It counts the whole days from the chosen date to your next birthday. Leap-day births roll to 1 March in non-leap years.