Calculating the Interquartile range is an important task as it can be used to find outliers. If you are finding ways how to calculate interquartile range in Excel, this is the right place for you. Here, in this article, you will find step-by-step ways to calculate the interquartile range in Excel.

## What Are Quartiles?

Quartiles are statistical values that divide the data into four equal parts. To divide the data into quartiles first sort the numbers in ascending order. Then it is cut into four parts.

The 25th percentile is called the First Quartile (Q1), the 50th percentile is known as the Second Quartile (Q2) or Median, 75th percentile is the Third Quartile (Q3).

**Example: **1, 1, 7, 3, 6, 4, 5, 6, 3, 6, 2**Ascending Order: **1, 1,** 2**, 3, 3, **4**, 5, 6, **6**, 6,7

Here, **Q1 **= **2 **Â Â Â Â **Q2/ Median **= **4**Â Â Â **Â Q3 **= **6**

## What Is an Interquartile Range (IQR)?

**Interquartile Range (IQR)** represents the **middle 50%** value of ordered data. It is the difference between the **Third Quartile(Q3)** and **First Quartile(Q1)**.

**Equation:** Â **IQR** = **Q3-Q1**

For the example given above, **Interquartile Range (IQR) **= **6 **â€“ **2 **= **4**

Here, you will find ways to calculate the **Interquartile Range (IQR)** of a dataset in Excel. Go through the steps and calculate the **IQR** for your own dataset. Here, we have a dataset containing the** Scores** of some students. We will calculate the **Interquartile Range (IQR)** of this data using the **QUARTILE function**.

## 1. Using QUARTILE Function to Calculate Interquartile Range in Excel

We can calculate **Interquartile Range** in Excel using **the QUARTILE function**. This function can calculate** IQR **in Excel by calculating **Q1** and **Q3** or else by using a direct equation.

For the first method, we will use the **QUARTILE function** to calculate the value of the **Interquartile Range (IQR)**.

Follow the steps to calculate the value of **IQR** for your own dataset.

**Steps:**

- To begin with, select Cell
**F6**. - Then, type the following formula.

`=QUARTILE(C5:C15,1)`

Here, in the **QUARTILE** function, we selected the range **C5:C15** as an **array** and gave **1** as **quart** where **1 **means **25th percentile**. Now, it will return the **first quartile** from the given **array**.

- Now, press
**ENTER**to get the value of**Quartile(Q1)**.

- After that, select Cell
**F7**. - Then, type the following formula.

`=QUARTILE(C5:C15,3)`

Here, in the **QUARTILE** function, we selected the range **C5:C15** as an **array** and gave **3** as a **quart** where **3 **represents the **75th percentile**. So, it will return the **third quartile** from the given **array**.

- Now, press
**ENTER**to get the value of**Quartile(Q3)**.

- Then, to calculate the value of the
**Interquartile Range (IQR)**find the difference between**Quartile(Q1)**and**Quartile(Q3)**. Type the following formula in cell**F8**.

`=F7-F6`

- Press
**ENTER**to get the value of the**Interquartile Range (IQR)**.

This is how you can **calculate **the value of the **Interquartile Range (IQR) **in Excel by using the **QUARTILE function**.

**Read More:** How to Calculate Range for Grouped Data in Excel

## 2. Inserting QUARTILE.INC Function to Calculate Interquartile Range in Excel

For the second method, we will calculate the **Interquartile Range(IQR) **by using the **QUARTILE.INC **function. Here, it includes the values from **0** to **1**.

Follow the steps below to do it on your own.

**Steps:**

- To begin with, select Cell
**C17**. - Then, type the following formula.

`=QUARTILE.INC(C5:C15,3)-QUARTILE.INC(C5:C15,1)`

Here, in the **QUARTILE.INC** function, we selected the range **C5:C15** as an **array**. Then to subtract **Q1** from **Q3** we gave **3** as a **quart** where **3 **means **75th percentile **in the first part of the equation and gave **1** as a **quart **where **1** represents** the 25th percentile **in the second part of the equation.

- Now, press
**ENTER**to get the value of the**Interquartile Range (IQR)**.

This is how you can **calculate **the value of the **Interquartile Range (IQR) **in Excel by directly using the **QUARTILE.INC function**.

## Things to Remember

- Here
**quart = 0, 2, 4**refers to**MIN**,**MEDIAN**, and**MAX**. You can also use these values in the**QUARTILE**function - Whenever the
**array**is empty It will show**#NUM**! error. - The
**#NUM!**error is also shown when**quart<0**or**quart>4**.

## Practice Section

You will find an Excel Sheet like this in this article. Practice on your own using these functions to calculate the **Interquartile Range (IQR)** of this dataset.

**Download Practice Workbook**

## Conclusion

So, in this article, you will find ways to calculate the interquartile range (IQR) in Excel. Use any of these ways to accomplish the result in this regard. Hope you find this article helpful and informative. Feel free to comment if something seems difficult to understand. Let us know any other approaches which we might have missed here.