Your age in seconds is the time since the moment you were born, counted in seconds: your age in days × 86,400, plus the seconds since midnight, minus the seconds between midnight and your birth time. Someone born at 8:30 AM on June 15, 1990 passed 1 billion seconds at 10:16:40 AM on February 21, 2022 — at about 31 years and 8 months.
Enter your date of birth, and your birth time if you know it, and the counter ticks live in your own time zone, alongside your age in minutes, hours, days and weeks.
Worked example
Date of birth: June 15, 1990Time of birth: 08:30
Seconds old — live: 1,147,931,771
Whatever the moment you read this, the count only grows: a billion seconds after 8:30 AM on June 15, 1990 was 10:16:40 AM on February 21, 2022.
Open this example in the calculator →How to use the Age in Seconds Calculator
- Enter your date of birth.
- Add your time of birth if you know it (it is on most birth certificates). Leave it blank to count from midnight.
- Watch your age in seconds, minutes and hours tick up live.
- Check the table for the moment you turn — or turned — 1 billion seconds old.
How many seconds are in a lifetime?
A day has 86,400 seconds (24 × 60 × 60). A common year has 31,536,000, a leap year 31,622,400, and an average year about 31,556,952 — call it 31.6 million. So:
- A 10-year-old is about 316 million seconds old.
- You turn 1 billion seconds old at about 31 years, 8 months and a week.
- A 50-year-old is about 1.58 billion seconds old; 2 billion seconds arrives at about 63 years and 4½ months.
Turning a billion seconds old
One billion seconds is 11,574 days, 1 hour, 46 minutes and 40 seconds. Add that to your birth date and time and you have the moment. It is the most popular "unbirthday" there is — rarer than a birthday, and late enough in life that most people have no idea when theirs was. Other round numbers come sooner: 1 million minutes at just under 2 years old, 100,000 hours at about 11 years 5 months, 10 million minutes at 19 years.
Why your birth time matters
Without a birth time the counter starts at midnight, so it can be up to 86,399 seconds — almost a day — ahead. Birth certificates in the United States and most of Europe record the time, usually to the minute. Use the local time where you were born; the counter runs on your device's clock, so if you now live in another time zone the difference is already taken care of to within the hour.
Leap seconds
Since 1972, 27 leap seconds have been added to the world's clocks to keep them in step with the Earth's rotation, the last at the end of 2016. Computer clocks — and so this counter — do not count them, so if you were born before 2017 you are, strictly, a few seconds older than shown. Leap seconds are due to be phased out by 2035.
Frequently asked questions
How many seconds old am I?
Enter your date of birth (and birth time if you know it) and the counter shows your age in seconds, ticking live. As a guide, every year of age is about 31.6 million seconds.
When am I 1 billion seconds old?
11,574 days, 1 hour, 46 minutes and 40 seconds after you were born — about 31 years, 8 months and a week. The calculator gives the exact date, and the time if you enter your birth time.
How many seconds are in a year?
31,536,000 in a 365-day year and 31,622,400 in a leap year.
How many minutes old am I?
Your age in seconds divided by 60 — it is shown under the seconds counter. A 30-year-old is about 15.8 million minutes old.
Does it count leap seconds?
No. Like nearly every computer clock it ignores the 27 leap seconds added since 1972, so the figure can be up to 27 seconds short for someone born before 1972.