Age calculator
Work out an exact age in years, months and days, plus the countdown to the next birthday.
- Runs in your browser
- Nothing uploaded
- Works offline
- No sign-up
About this tool
Enter a date of birth (and optionally a different "as of" date) to get an exact age broken down into years, months and days, the total number of days lived, and how long until the next birthday. All the date maths happens in your browser.
How to use it
- Enter the date of birth.
- Leave "as of" set to today, or change it to work out age on another date.
- Read the age in years, months and days, plus total days and the next-birthday countdown.
Frequently asked questions
How are months and days counted?
The same way people say their age: full months and days that have actually elapsed, accounting for different month lengths and leap years.
Can I calculate age on a past or future date?
Yes - set the "as of" date to any date on or after the date of birth.
Is my date of birth stored?
No. Nothing is saved or sent; it is cleared when you leave the page.
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