How Many Seconds Are in a Century?

1 century has 3,155,760,000 seconds.

Most years have 31,536,000 seconds.

However, we also have to take into leap years.

A century has 100 years.

Leap year is every 4 years.

That means we have 25 leap years per century, dividing 100 by 4.

If it’s a leap year, then 1 year has 31,622,400 seconds.

Knowing this, we can do our calculation.

Seconds in a century calculation

= 75 normal years (seconds) + 25 leap years (seconds)

= 75 * 31,536,000 + 25 * 31,622,400

= 3,155,760,000

That’s almost 3.2 billion seconds.


How do we know the number of seconds in a year?

But let’s also back up for a second because we simply told you the number of seconds in a year.

Let’s go through step-by-step how we got there:

– We know that 1 year has 365 days (366 days during leap year).

– We know that 1 day is 24 hours.

– 1 hour is 60 minutes.

– And we know that 1 minute is 60 seconds.

So if we multiply all that through, we have:

= 365 days per year x 24 hours per day x 60 minutes per hour x 60 seconds per minute

= 31,536,000 seconds per year

Of course, now that you know that there are 86,400 seconds per day, you can calculate how many seconds there are…

per week

per month

per year (above)

per decade

…and virtually every other expanse of time.

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