How Long is a Decade? [All You Need to Know]

Before answering the question of how long is a decade, let’s take a look at the facts surrounding the term “decade”. A decade was officially added to the English language in 1590. It is commonly used to refer to every ten years during the course of a century. For example, the 1680s or 1930s, which refer to the years 1680-1689.

Decades signify distinct periods in the Georgian calendar. Their calendar has no zero, so if you mention the 1850s, it refers to the years 1851–1860.

When establishing individual decades in a century, the Georgian calendar differs from the conventional calendar. For example, the 1980s commonly refer to the years 1980–1989 as a whole. However, according to the Georgian calendar, the 190th decade runs from 1981 to 1990.

It’s high time we dive right in and answer this troubling question of how long is a decade.

How Long is a decade?


Still, confused about how long is a decade? The use of decades to represent ten-year periods has made it easier for humans to differentiate key historical events. Decades have enabled humans to rapidly recognize specific historical events, such as the 40s or 30s, which refer to the 1940s and 1930s, respectively.

Each decade is given a moniker based on noteworthy events that occurred during that time period. The ‘roaring twenties,’ which refers to the period in the 1920s when there was a lot of cultural change and economic expansion, is a good example in US history.

Most historical events are separated into decades, making it easier for people to discern between events that occurred at different times in the past.

Aside from historical events, age may also be divided into decades. The following is a breakdown of ages in their respective decades:

Name of the periodNumber of Years it coversSomeone in their
Vicenarian20-29The 20s
Tricenarian30-39The 30s
Quadragenarian40-49The 40s
Quinquagenarian50-59The 50s
Sexagenarian60-69The 60s
Septuagenarian70-79The 70s
Octogenarian80-89The 80s
Nonagenarian90-99The 90s
Centenarian100 and above

The term decade has also been applied to the era in the 1990s when Japan’s economy collapsed. The period was known as the “lost decade,” and it occurred just after World War II.

When the Finance Minister raised interest rates, the economy crashed. The increase in prices caused the stock market to fail, affecting the country’s economic progress.

The crisis lasted nearly a decade and continues to have an impact on the Japanese corporate market.

Other Calendar Terminology

A century is a period of one hundred years, such as the nineteenth century. The nineteenth-century spans the years 1901 to 2000. 

A bicentennial is a span of 200 years.

  • The term “millennium” refers to 1000 years.
  • One million years are described by the term mega annum.
  • A fortnight is a period of two weeks.
  • A score is valid for 20 years, while a lustrum is valid for five years.
  • A biennium, triennium, or quadrennium is a short period of two, three, or four years.

Why is the Decade Ten Years Long?

The term decade comes from the Greek word ‘dekas,’ which means a group of ten. The Romans employed the syllable dec- to distinguish items gathered in tens: for example, decathlon and decagon. The two names refer to a group of ten items. As a result, the word dec- was inserted into the calendar to represent the passage of ten years.

Determining How Many Years Equals a Decade and How Long is a Decade

  • Decade = years divided by 10
  • 1 year is equivalent to 0.1000664383561 Decade
  • 0.1000664383561 multiply by 10 = 1 Decade
  • 1 year has 525, 600 minutes x 10 years or 1 Decade = 5, 256, 000 minutes
  • 5, 256, 000 minutes x 60 = 315, 360, 000 seconds for a decade

Consider how long those moments lasted.

You simply have to be grateful if you survived those seconds, minutes, days, years, and decades. Remember that every second counts since being up every morning are a huge blessing.

How Long is a Decade? What Is the Length of a Century?

  • 1 Century is equivalent to 10 decades century is equivalent to a 100-year period
  • 1 Decade Is the same as 0.1 century
  • One century decade is equivalent to ten years

Let Us Expand More!

  • Sixty seconds make one minute
  • One hour contains 60 minutes
  • 60 seconds x 60 minutes = 3,600 seconds
  • A day has 24 hours
  • 12 hours from morning to noon and 12 hours from evening to midnight Equals 24 hours
  • 1 hour equals 60 minutes
  • 12 hours divided by 60 minutes equals 720 minutes (am)
  • 12 hours divided by 60 minutes equals 720 minutes (pm)
  • 24 hours x 60 minutes equals 1,440 minutes per day; 1,440 minutes x 60 seconds equals 86,400 seconds each day

FAQs on How Long is a Decade

Exactly how long is a decade?

To directly answer the question of how long is a decade, a decade is simply 10 years. For example, the 1530s often refers to the years 1530-1539.

How long is a decade and a half?

A decade and a half equal 15 years; because a decade is ten years, half a decade equals five years. As a result, (10+5) years equals a total of 15 years.

How long is a decade and a century?

A decade is defined as 10 years, whereas a century is defined as 100 years. The two terms derive from the Latin term “Decuria,” which means “a group of ten men,” and were commonly utilized in the military by the Romans.

The term “centuria” was used to describe things made up of 100 components. The term “centuria” derives from the Latin word “saeculum,” which means “a hundred years.”

More specifically, it can depict a group of individuals born at a specified time or a cohort of individuals born within the same range.

In effect, we’re referring to generational notions like Gen Z, Millennial, and so on.

At the same time, a century can be viewed as a definition of a long human life that eventually covers four generations.

What is the calculation formula for how long is a decade?

The calculation of the decade formula is based on two degrees of view or two perspectives, one of which indicates that a new decade begins with a year (the year should have zero as the last digit) and ends with a year that also has zero as the last digit.

For example, the 1980s in the twentieth century began in 1980 and concluded in 1989.

The same is true for the twenty-first century; consider the 2000s, a decade that began in 2000 and ended in 2009.

Another point of view is that a decade begins with the final number being one and ends with the last number being zero. For example, the tenth decade of the twentieth century ran from 1991 to 1999. Similarly, 2030 will be the final year of this decade.

It is worth noting that the year 2020 is either the start of a new decade or the end of a decade; this has no bearing on life and its essence. However, this is also dependent on each individual’s point of view.

Conclusion on How Long is a Decade

Finally, decades are well known to have cultural symbolism, such as rebirth or a blank slate from which people might begin their lives anew.

Furthermore, a decade is characterized as a specific period that idolizes our experience, giving the concept of “decade” a lot of meaning.

In American history, decades are frequently described as a moniker that incorporates significant cultural events or is used as a symbol to signify cultural fundamentalism at the time.

For example, the 1940s are sometimes referred to as “The Fighting Forties,” referring to the United States’ participation in both the European and Pacific theatres of World War II (WWII).

A decade can also be used to refer to the historical component of time, that is, the division of events that occurred in their respective decades.

Excellent; I hope this post has answered your question.

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