Age Calculator

How to use Age Calculator

1. Enter your date of birth.
2. Optionally change the "as of" date — it defaults to today.
3. Click Calculate Age to see your exact age in years, months, and days, plus a countdown to your next birthday.

Frequently asked questions

How is my age calculated so precisely?
The tool works out the exact number of full years, months, and remaining days between your date of birth and the comparison date, accounting for different month lengths and leap years — not just a simple year subtraction.

Can I calculate my age as of a past or future date?
Yes. Change the "calculate age as of" field to any date — useful for figuring out how old you were on a specific day, or how old you'll be on a future one.

What about a February 29 birthday?
In years without a February 29, this calculator counts the birthday on February 28. Customs and laws differ on whether to use February 28 or March 1, so check locally if it matters for something official.

Is my birth date sent anywhere?
No. The calculation happens entirely in your browser using JavaScript's date math — nothing is transmitted to a server.