Age Calculator

How to use the Age Calculator

1. Enter your date of birth using the date picker or type it in directly.
2. Your exact age in years, months, and days appears instantly.
3. View additional details including total days lived, total weeks lived, and what day of the week you were born.
4. Check the next birthday countdown to see how many days remain and what day of the week it falls on.

Why leap years complicate this more than you'd think

Someone born on February 29 technically has a birthday that doesn't exist most years. This calculator (like most legal and administrative conventions) treats March 1 as the observed birthday in non-leap years, which matters if you're checking eligibility for something with an exact age cutoff. More generally, "how many days old am I" isn't simply (years x 365): leap years add roughly one extra day every four years, which adds up to real drift over a few decades if you're doing it by hand.

Frequently asked questions

Does it account for leap years accurately?

Yes, the calculation uses actual calendar dates rather than an average day count, so leap years are handled correctly automatically.

What day of the week was I born on?

Enter your birth date and the tool calculates it directly, a fact that's genuinely hard to work out by hand more than a few years back.

Can I calculate the age of something other than a person, like a pet, a car, or an anniversary?

Yes, the calculation works on any two dates; it's just framed around birthdays because that's the most common use.