Many times while reading and watching a television show, we **heard about the decade**. Sometimes in news channels as well, people are talking about the wars that happened decades ago. We don’t know how far they are talking about in the past, but we can figure out that it will be ten years ago or more than that. The history is full of decades and their situations. Most people discuss current affairs or history.

**In this article, you will get all the answers about “how long is a decade& Century? How to Calculate it?**

When we hear “**Decades**”, ever since we assume from where this word comes from? Why do people call it decade or decades, not anything else? To get the answer, we have to pass decades to know the reason behind the decade word. It sound’s funny, don’t you think.

**What is Decade History?**

According to many believers, the decade word came from the Greek word dekas which means “a group of ten”. The decade is known for ten years to go farther; the word used is **decades**. For 15 years, you can use a decade and a half; for 25 years, you can use two decades and a half and just go on with the series for more years.

Well, we all hope there are more words in daily use that will define more than ten years. There are some words, but they are more scientific and not in everyday use. You can read below and try to remember it.

- 10 Years (Decennial)
- 20 Years (Vicennial)
- 30 Years (Tricentennial)
- 40 Years (Quadrennial)
- 50 Years (Semicentennial)
- 60 Years (Sexagennial)
- 70 Years (Septuagennial)
- 80 Years (Octogintennial)
- 90 Years (Nonagintennial)
- 100 Years (Centennial)

**How Many Years in a Decade?**

There are ten complete years in a decade. Well, there are some philosophical and scientific debates in a decade. According to the scientist, the number we count are 0-9, which counts total as 10, so according to them, the year must count on this structure, for example, 1980-1989, 1990-1999 these periods are known as the decade which counts 0-9 only.

From 1990 or from 2000 another decade begins, it will not count on the same decade. It is scientific, so people must agree with this formula, but everyone agrees.

According to the historians, philosophical, astrological, and other people where we include the common people count the number from 1-10. We all know that we start teaching our kids from number 1 to number 0; it came last.

So the other people counts **decades** from 1-10 instead of 0-9. According to the 1-10 is the easiest way to remember a decade because in terms of math for a small kid, it is easy to remember and they can easily figure it out, and they want to confuse between the numbers which true.

They count 1981-1990, and 1991-2000 as a decade, it shows the 1-10 number formula which is quite easy to remember. Still, people are debating on this, and it will go on doesn’t matter how long it will go.

So, at last, the decade will be ten years. And the collection of 10 years ten times leads to the century.

**How Many Years are in a Decades**

It depends on how much you are asking for. **Decades** leads up to 100 years. Because after 100 years, it will be a century. According to many people right now, we are living in the 21st century, and according to some people, we are still in the 20th century. No matter who is right but we have to choose our way to count the decades.

**How Many Years in a Century?**

There are 100 years in a century, the 200 years known as centuries, and it goes on because we don’t have particular differentiation for a century as well. So next time when you hear the century, just remember that it takes 100 years to change things.

**How to Calculate Decade and Century?**

- 1 min = 60 sec
- 1 hr = 60 min
- 60 min x 60 sec = 3,600 sec
- 24 hrs in a day
- 24 hrs x 60 min = 1440 min in a day
- 1440 x 60 sec = 86,400 sec in a day.
- 28 days for February month
- 1 day = 1, 440 min
- 1,440 min x 60 sec = 86, 400 sec in a day
- 28 days x 1, 440 min = 40, 320 min in a month
- 40, 320 min for February month x 60 sec = 2, 419, 200 sec for 28days
- For 30 days in a month
- 30 days x 1, 440 min =43, 200 min in a month
- April, June, September, November = 120 days
- 120 days x 1,440 min = 172, 800 min in 4 months
- 43, 200 min a month x 4 = 172, 800
- 172, 800 min for 4 months x 60 sec = 10, 368, 000 sec for 120 days.
- For 31 days in a month
- 217 days x 1, 440 min = 312, 480 min in 7 months
- 44,640 min in a month x 7 = 312, 480
- 312, 480 min for 7 months x 60 sec = 18, 748, 800 sec for 217 days
- Now Count it to the Year
- 365 days x 1440 min = 525, 600 min
- 525, 600 min x 60 sec = 31, 536, 000

**Conclusion:**

The period of a **decade** is ten years that have lots of time, and many things will get changed in this period. So next time, if someone asked for a decade, ask them to read it and get the knowledge about it.