**A period of ten years is called a decade. The word “decade” is derived from the Ancient Greek word “δεκάς (dekas)”, which means “ group of ten”.**

## One Decade

**A decade can be any period of 10 years** to which one is referring to. However, popular decades in the 1900s refer to specific periods that were known for different things. For example:

- The ’60s (A decade from 1960 to 1969) was known as a time of revolution and protesting for civil rights.
- The ’70s (A decade from 1970 to 1979) was known for hippies, bell-bottom pants, and disco.

Also, 2 decades would mean 20 years (2 x 10 years).

## Months In A Decade

To calculate the number of months in a decade, use this formula:

**Months in a Year x Years in a Decade = Months in a Decade**

- 12 months per year x 10 years per decade = 120 months

**There are a total of 120 months in a decade.**

## Weeks In A Decade

Figuring out the weeks in a decade seems straightforward, but it’s a little more complicated. If we went with the common thought that 1 year had 52 weeks, then 1 decade would have 520 weeks (52 weeks x 10 years).

However, there are actually 52.1 weeks in a year and 52.3 weeks in a leap year, so that makes it a bit more complicated. There is a leap year every 4 years with an extra day that year. Depending on when the count of the decade starts, there will be either 2 or 3 years with a leap year within that decade.

So, let us take a few steps back and find out the total days in a decade first. This image demonstrates that based on the number of leaps year,

Now that we know there are 3652 to 3653 days in a decade, divide that by a week to get the weeks in a decade. Here is the formula:

**Days in a Decade / Days in a Week = Weeks in a Decade**

**Decade with 3 Leap Years**: 3653 days / 7 weeks = 521 weeks and 6 days (521.8 weeks)**Decade with 2 Leap Years**: 3652 days / 7 weeks = 521 weeks and 5 days (521.7 weeks)**No Leap Years**: 3650 days / 7 weeks = 521 weeks and 3 days (521.4 weeks)

**There are 521 weeks in a decade plus either 5 or 6 extra days.**

## Days In A Decade

Once again, there would be 3650 days in a decade if there weren’t any leap years. Since there are, you can have either **3652 or 3653 days in a decade.**

**Decade with 3 Leap Years**: 3653 days: 3652 days**Decade with 2 Leap Years****No Leap Years**: 3650 days

## Hours In A Decade

**A decade is made up of 87,648 to 87,672 hours.**

**Hours in a Day x Days in a Decade = Hours in a Decade**

**Decade with 3 Leap Years**: 24 hours per day x 3653 days = 87,672 hours: 24 hours per day x 3652 days = 87,648 hours**Decade with 2 Leap Years****No Leap Years**: 4 hours per day x 3650 days = 87,600 hours

## Minutes In A Decade

**There are 5,258,880 to 5,260,320 minutes in a decade.**

**Minutes in an Hour x** **Hours in a Day x Days in a Decade = Hours in a Decade**

**Decade with 3 Leap Years**: 60 minutes per hour x 24 hours per day x 3653 days = 5,260,320 minutes: 60 minutes per hour x 24 hours per day x 3652 days = 5,258,880 minutes**Decade with 2 Leap Years****No Leap Years**: 60 minutes per hour x 24 hours per day x 3650 days = 5,256,000 minutes

## Seconds In A Decade

**One decade is made up of 315,532,800 to 315,619,200 seconds.** To calculate this we would use this formula:

**Seconds in a Minute x Minutes in an Hour x** **Hours in a Day x Days in a Decade = Seconds in a Decade**

However, since we just calculated the minutes in a decade, we can take a shortcut with the following calculation:

**Seconds in a Minute x Minutes in a Decade = Seconds in a Decade**

**Decade with 3 Leap Years**: 60 seconds per minute x 5,260,320 minutes (3653 days) = 315,619,200 seconds: 60 seconds per minute x 5,258,880 minutes (3652 days) = 315,532,800 seconds**Decade with 2 Leap Years****No Leap Years**: 60 seconds per minute x 5,256,000 minutes (3650 days) = 315,360,000 seconds

## Conclusion

That was a lot of math, but it’s so interesting to learn the intricacies of time! Now we know how to convert it into various units.

A decade is 10 years. It is made up of:

- 120 months
- 521 weeks plus 5 or 6 extra days
- 3652 or 3653 days in a decade
- 87,648 to 87,672 hours
- 5,258,880 to 5,260,320 minutes
- 315,532,800 to 315,619,200 seconds