Your date of birth stays on this page — it is never sent or saved

Age Calculator

Q: How is my age worked out?

You are 0 on the day you are born and gain a year on every birthday — the way age is counted almost everywhere. The moment the reference date reaches your birthday, the figure goes up; the day before your birthday you are still the previous age.

Your exact age in years, months and days — plus the countdown to your next birthday and how long you have been alive. 🎂

Date of birth

Age on this date (today by default)

0 B uploaded — nothing you enter has been sent anywhere?

Nothing is recorded — the whole calculation happens inside this page, so the date of birth you type is never sent to a server and never saved. Refresh and it is gone.

Other tools send what you type to a server and process it there. Even when they promise to erase it afterwards, your text sits on someone else’s machine in the meantime. Here there is no sending step at all. The more sensitive the content — passwords, contract wording, private notes — the more that difference matters. See how to verify it →

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Your exact age today, or on any date you choose

This calculator turns a date of birth into your exact age in years, months and days, the countdown to your next birthday, the number of days you have been alive, the weekday you were born on and your star sign. You can move the second date to a deadline or any future day to see your age then. Your date of birth stays in your browser.

A closer look

The page counts age the way almost every country does today: you are 0 on the day you are born and gain a year on each birthday, starting on the birthday itself. That sounds obvious, but it is not the only system. South Korea, where this site is made, long counted a newborn as one year old and added a year every 1 January, and it made international age the legal standard only in June 2023. The Korean version of this tool still shows those older counts side by side for Korean paperwork; this page shows international age only.

The arithmetic compares calendar dates rather than dividing by 365, so edge cases come out right. The months-and-days part borrows the length of the previous month when needed, and someone born on 29 February gains a year on 1 March in ordinary years, the most widely used convention. Days alive is the exact number of calendar days between the two dates, leap days included, shown with a rough week count underneath. Star signs use the date ranges common in Western astrology, so a birthday right on a boundary may land one sign away from another chart.

How to use it

Choose your date of birth with the Year, Month and Day menus, or pick it from the calendar field beside them. The two stay in sync.
The second date, Age on this date, starts at today. Change it to check a deadline or a future day, and press Today to return.
Press Calculate age. From then on, any change to either date recalculates instantly.
Read the results: your age with years, months and days, days until your next birthday with its date and weekday, days alive, the weekday you were born on and your star sign with its date range.

When it helps

Eligibility cut-offsSet the second date to an application deadline to see whether you meet a minimum or maximum age on that exact day.

Age on a travel or start dateCheck how old a child will be on the day of a trip, or how old you will be on the first day of a new job, when a form asks for age at that date.

Birthday planningSee how many days are left and which weekday the next birthday falls on before you book anything.

Milestone daysWatch the days-alive counter to catch round numbers such as your 10,000th day and mark the occasion.

Common snags

It says the year was not a leap year.You picked 29 February in a year that had no such day, so check the year of birth. Impossible dates such as 31 April show “That date does not exist — please check it.”

It says the date of birth comes after the date I am checking.The second date is set earlier than the birth date. Press Today to reset it, or choose a later day.

My star sign differs from another website.Sources disagree on the boundary days by a day or so. This page uses common Western ranges, for example Sagittarius until 21 December and Capricorn from 22 December.

I can’t get a result for a year before 1900.The year menu runs from the current year back to 1900, and earlier birth dates are not calculated.

Tip If a form asks for your age at your last birthday, that is simply the years figure; the months and days after it show how far you are into the next year.

Age calculator FAQ

How is my age worked out?

You are 0 on the day you are born and gain a year on every birthday — the way age is counted almost everywhere. The moment the reference date reaches your birthday, the figure goes up; the day before your birthday you are still the previous age.

What if I was born on 29 February?

Leap day only exists every four years, so in ordinary years this calculator treats 1 March as the day you gain a year — the most widely used convention. The countdown follows the same rule: it points at 29 February in a leap year and at 1 March otherwise.

Why isn't "days alive" just my age × 365?

Because of leap days. An extra day is added almost every fourth year, so the true total runs several days ahead of the round number. This counter walks the real calendar, so every leap day you have lived through is included.

Can I check my age on some other date?

Yes — that is what the second date is for. Set it to a start date, an exam deadline, a visa cut-off or any future day, and the age, the birthday countdown and the day count are all recalculated for that date.

Is my date of birth sent or stored anywhere?

No. Everything is worked out inside this page, so nothing is uploaded and nothing is kept. You can disconnect from the internet and it will still calculate exactly the same.