Age Calculator

How to Use This Age Calculator

Enter your birth date in the first field. By default, your age is calculated as of today. You can uncheck "Use today's date" and pick another date to see your age on a specific day (e.g. a past or future date). Click "Calculate Age" to see your exact age, total days lived, total weeks and months, days until your next birthday, and the day of the week you were born.

Why Use an Age Calculator?

An age calculator is useful for filling forms that ask for age in years and months, checking eligibility by age, planning events (e.g. "in 100 days I turn 25"), or simply satisfying curiosity about how many days you've been alive or which weekday you were born on.

How We Calculate Age

Age is computed from your birth date to the reference date (today or the date you choose). We count full years, then remaining months, then remaining days. Total days lived is the number of calendar days between the two dates. "Days until next birthday" is the number of days from the reference date until your next birthday; if the reference date is after your birthday this year, we count until your birthday next year.

Frequently Asked Questions

Is this age calculator accurate?

Yes. The calculator uses calendar dates and standard date arithmetic. Results are for informational use only and depend on the dates you enter.

Can I calculate age as of a past or future date?

Yes. Uncheck "Use today's date" and select any date. You can see how old someone was on a specific date in the past or how old they will be on a future date.

What time zone is used?

Dates are interpreted in your local time. We do not use a specific time zone; the calculation is based on calendar days only.

Why does it show "Born on (day of week)"?

The day of the week is derived from your birth date. This is often used for fun facts, astrology, or personal records.