Online Age Calculator — Years, Months & Days

Q: How do I calculate my exact age?

Enter your date of birth and (optionally) an 'As of' date. The tool shows years, months, days, total days lived, and your next-birthday countdown.

Q: Does any of my data leave my browser?

No. All calculations run locally in your browser; nothing is sent to a server.

Enter dates

Date of birth

As of

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How to use

Select your Date of birth. Use the calendar button to open the native picker.
As of defaults to today—change it if you want age on another date (past or future).
Click Calculate (or press Enter) to see years, months, days and total days lived.
Use Copy to copy the result, or Reset to clear and start over.

Tips

Calendar buttons call the browser’s native date picker; if unsupported, the field just focuses.
Leap-day birthdays (Feb 29) are handled: in non-leap years, the next birthday is observed on Feb 28.
“As of” can be future-dated to see how old you’ll be on that day.
Works offline once loaded; no data leaves your browser.

FAQ

How do I calculate my exact age?

Enter your date of birth and (optionally) an “As of” date. The tool shows years, months, days, total days lived, and your next-birthday countdown.

Does it handle leap day birthdays (Feb 29)?

Yes. On non-leap years, Feb 29 birthdays are observed on Feb 28 for next-birthday logic.

How is the next birthday calculated?

The next birthday is the next calendar occurrence of your birth month/day (with Feb 29→Feb 28 in non-leap years). The counter shows how many days remain.

Can I set a future “As of” date?

Yes. Set any future date to see how old you’ll be on that day.

Does any of my data leave my browser?

No. All calculations run locally; nothing is uploaded.

Does it work offline?

Yes. After the first load, it works without internet.

Related tools

More date & time utilities:

Stopwatch & Countdown Calculator Unit Converter

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