Age in Seconds Calculator

Enter your date of birth and optionally a current date/time to find out exactly how many seconds you've been alive. The Age in Seconds Calculator also breaks down your age into minutes, hours, days, and years — giving you a full picture of time elapsed since birth.

Enter your date and time of birth. Time defaults to midnight if unknown.

Defaults to now. Change this to calculate age at a specific point in time.

Results

Your Age in Seconds

--

Age in Minutes

--

Age in Hours

--

Age in Days

--

Age in Years

--

Frequently Asked Questions

What is a second?

A second is the base unit of time in the International System of Units (SI). Historically, it was defined as 1/86,400 of a day (since there are 86,400 seconds in a 24-hour day). Today, it is scientifically defined based on the vibrations of cesium-133 atoms, making it extraordinarily precise.

How do I calculate my age in seconds?

To calculate your age in seconds, find the total number of days between your date of birth and today, then multiply by 86,400 (the number of seconds in a day). For even more precision, account for the exact time of birth. This calculator handles all of that automatically, including leap years.

How many seconds are in a day?

There are exactly 86,400 seconds in a standard day — 24 hours × 60 minutes × 60 seconds = 86,400. Leap seconds are occasionally added to atomic clocks to keep them aligned with Earth's rotation, but for everyday age calculations these are typically ignored.

Does this calculator account for leap years?

Yes. The calculator works by computing the exact difference in milliseconds between your birth date and the current (or selected) date using precise date arithmetic. This automatically accounts for all leap years and varying month lengths in between.

What is my age in seconds if I was born on the 2nd of February 1998?

As of early 2025, someone born on February 2, 1998 would be approximately 27 years old, which translates to roughly 852 million seconds. The exact figure depends on the precise current date and time — enter your birth date into the calculator above for an exact count.

Why are there 60 seconds in a minute?

The division of a minute into 60 seconds originates from the ancient Babylonian base-60 (sexagesimal) number system. Babylonian astronomers divided time using this system, which was later adopted by Greek astronomers and eventually became the global standard for timekeeping.

Can I use this calculator to find someone else's age in seconds?

Absolutely. Simply enter the person's date of birth in the first field. You can also change the 'Current Date & Time' field to any date — for example, to find out how many seconds old someone was on a specific historical date or future milestone.

How long is one billion seconds in years?

One billion seconds is approximately 31.69 years. So if you are older than about 31 years and 8 months, you have already lived more than a billion seconds — a fun milestone worth celebrating!

More Time & Date Tools