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Age Calculator

Find your exact age in years, months and days, plus total days lived and a countdown to your next birthday.

100% Client-Side

Enter a date of birth — your exact age and next birthday appear instantly.

How to use the Age Calculator

  1. 1

    Enter the date of birth.

  2. 2

    Leave "Age on" as today, or pick another date to find the age on that day.

  3. 3

    Read the age in years, months and days, plus totals in months, weeks, days and hours.

  4. 4

    See which weekday you were born on and how many days remain until the next birthday.

Frequently asked questions

We count whole years first, then whole months, then the remaining days — the same way people normally state an age. If the day of the month hasn't been reached yet, the days borrow from the length of the previous month.

Yes. Change the "Age on" date to see how old someone was on a specific day, or will be on a future one — useful for forms, eligibility rules and anniversaries.

In years without a February 29, the next birthday is shown as February 28. Your age in years still increases on that date.

Only for the default "today" date, which uses your device's local date. The calculation itself works on calendar dates, so daylight-saving changes never shift the result.

No. Everything is calculated in your browser and nothing is saved or sent anywhere.

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