How Many Seconds Are in a Decade?

1 decade has 315,360,000 seconds.

That is, if we go by the typical per-year total, which is 31,536,000 seconds.

However, if we want to be more accurate, we have to take into leap years.

There are 2 or 3 leap years per decade. In the 2020s, for example, there are 3 leap years (2020, 2024, 2028). In the 2030, there will be only 2 (2032, 2036). And back to 3 leap years in the 2040s, and so on.

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

Seconds in a decade calculation

Two leap year decades

That means in decades with 2 leap years, we have the following math:

= 8 normal years (seconds) + 2 leap years (seconds)

= 8 * 31,536,000 + 2 * 31,622,400

= 315,532,800

We note that it’s close, but not exact, to our number mentioned at the top. (It’s 0.05% greater.)

Three leap year decades

In decades with 3 leap years, we have the following math:

= 7 normal years (seconds) + 3 leap years (seconds)

= 7 * 31,536,000 + 3 * 31,622,400

= 315,619,200

That’s 0.08% greater than the figure cited at the beginning of this article.


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 century

…and virtually every other expanse of time.

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