Age Calculator

The Age Calculator takes your date of birth and computes your age relative to today (or a target date of your choice). It uses calendar arithmetic to count full years, then the remaining complete months, then the remaining complete days. For example, someone born on June 15, 2000 is, on October 3, 2026, exactly 26 years, 3 months and 18 days old. The calculator also shows total days and hours lived, a countdown to the next birthday, and the zodiac sign and weekday of the birth date.

The calculation uses strict calendar rules. First, it counts complete years from the birth date to the reference date. It then counts the remaining complete months, adjusting for months that have different lengths. Finally, it counts the remaining days. For example, if you were born on January 31 and the reference month is March, the tool correctly accounts for February's 28 or 29 days rather than assuming 30. This is why the result can differ by a day compared to tools that simply divide the total day count.

The My age on a date mode lets you calculate how old you were or will be on any specific date, a past anniversary, a future milestone, a retirement date, or any day of curiosity. Enter your date of birth, switch to this mode, then pick any date as the reference. The calculator shows your exact age on that day, along with your next birthday from that date and the full life-stats breakdown. This is useful for checking age eligibility as of a specific date, planning events, or answering historical questions.

The calculator finds the next occurrence of your birth month and day after the reference date, today in normal mode, or the target date in "My age on a date" mode. If your birthday has already passed this year, it uses next year's date. The progress bar shows how far through the current birthday cycle you are, from your last birthday to your next one. If the reference date falls exactly on your birthday, the tool shows a special message and counts toward the following year.

The Western zodiac assigns a sign based on the calendar date of birth. Each sign covers a specific date range: Aries (March 21–April 19), Taurus (April 20–May 20), Gemini (May 21–June 20), Cancer (June 21–July 22), Leo (July 23–August 22), Virgo (August 23–September 22), Libra (September 23–October 22), Scorpio (October 23–November 21), Sagittarius (November 22–December 21), Capricorn (December 22–January 19), Aquarius (January 20–February 18), and Pisces (February 19–March 20). The calculator applies these standard date boundaries to your birth month and day.

The total hours lived count assumes you were born at midnight on your birth date, since the tool only takes a date and not a time of birth. Your actual number of hours lived depends on your exact birth time, which can shift the count by up to 23 hours. In My age today mode, the live counter updates every second so the display is always current, but it remains an approximation relative to your true birth time. The years, months and days calculation is not affected, it uses calendar dates only and is always exact.

No. The Age Calculator runs entirely in your browser. Your date of birth is never transmitted to any server, logged, or shared with anyone. Your last-used date is saved only in your browser's temporary session memory, which is automatically erased when you close the tab. Nothing persists across sessions. PureTools never collects or stores any personal data. Your data is never used to train AI models or improve machine learning systems.

Yes. The calculator works for any start date, not just human birthdays. Enter the founding date of a company, the construction date of a building, or a pet's birthday to get the same precise breakdown. The My age on a date mode is particularly useful here, for example, finding out how old a business was on a specific anniversary, or verifying how long a contract has been active as of a certain date. For pregnancy-related calculations, the Due Date Calculator provides trimester breakdowns and key clinical milestones.

In My age today mode, the calculator starts a live timer that updates every second. It shows your total hours, minutes and seconds lived since midnight on your birth date. This is a continuously running count, so if you leave the page open, the counter keeps ticking. The timer stops automatically when you switch to My age on a date mode or when you close the tab. The years, months and days shown above the counter are recalculated from calendar dates and are not affected by the live timer.