Excel is a powerful tool to handle large data sets and charts. In Excel, we often use the **Scatter Plot** to visualize our data, find any **correlation** among the variables, and understand any trends in the data. Sometimes we need to add a horizontal line in the **Excel Scatter Plot**. In this article, we are going to learn 2 quick and effective methods to add horizontal line in the Excel **Scatter Plot**.

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## What Is a Scatter Plot?

**Scatter Plots** are widely used to determine any correlation among the variables of a chart. If there is any correlation, the points on the **Scatter Plot** will be close to each other. On the other hand, if there is no correlation then the points on **Scatter Plot** will be randomly distributed. By using **Scatter Plot**,Â we can also understand if there is any trend in the data set or not.

## 2 Methods to Add Horizontal Line in Scatter Plot in Excel

We can add horizontal lines in excel by using 2 quick methods. Now we are going to learn these 2 methods.

In the following data set, we have the **Age** of 10 **Persons**. We are going to implement a **Scatter Plot** using this data set and later on we will add a horizontal line to it.

### 1. Inserting Extra Column to Add Horizontal Line

We can add horizontal lines in a **Scatter Plot** very easily by adding an extra column in our data set. Letâ€™s proceed one step at a time.

__Step 1: Insert an Extra Column__

Letâ€™s assume that we are going to insert the horizontal line at *Age* **23**. For this reason, we will create an extra column named **Line Position** and insert **23 **in all of the cells of that column.

**Step 2: Create the Scatter Plot**

Now, select your data and go to the **Insert** tab from the ribbon. After that, click on** Insert Scatter (X, Y) or Bubble Chart**. Then select **Scatter** from the** Scatter** drop-down.

__Step 3: Select Format Data Series__

Now, right-click on any point of the series, and after that select **Format Data Series**.

__Step 4: Choose a Solid Line__

Next, select **Solid Line** from the **Format Data Series** dialogue box as highlighted in the following picture.

__Step 5: Click on Horizontal Line Point__

Right-click on any point of the horizontal line and click on **Format Data Series**.

__Step 6: Select Solid Line__

Now, choose **Solid Line** from the **Format Data Series **dialogue box.

__Step 7: Remove Markers of Horizontal Line__

From the **Format Data Series** dialogue box, under the **Marker** tab choose **None** from the **Marker Options**.

At this stage, you will be able to see the horizontal line on your **Scatter Plot**.

**Read More: ****How to Add Line to Scatter Plot in Excel (3 Practical Examples)**

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### 2. Editing Scatter Plot to Add Horizontal Line

In this method, we are not going to use any extra column to add the horizontal line. Rather, we will edit our **Scatter Plot** to introduce a horizontal line in it.

__Step 1: Create an Extra Column__

Follow the instructions in **Step 1 of the 1st Method**.

__Step 2: Create a Scatter Plot__

Redo **Step 2 of Method 1**.

__Step 3: Select Format Data Series__

Follow the instructions in **Step 3 of Method 1**.

Now, right-click on any empty space in the chart and choose **Select Data**.

Afterward, select **Add** from the **Select Data Source** dialogue box.

__Step 6: Specify the Position of the Line__

- Now another dialogue box will pop up, called
**Edit Series**. First, name the series in the**Series Name**box. In this case, we are using the name,**Horizontal Line**. - Then in the
**Series X values:**box, insert the start point and end point of the X value for our horizontal line. Here it is**= {1,12}**. - After that, in the
**Series Y values:**box, enter the start point and the end point of the Y value for our horizontal line. In this case, it is**= {23,23**}. - Afterward, press
**OK**.

__Step 7: Close Select Data Source Dialogue Box__

Now, press **OK** from the **Select Data Source** dialogue box.

__Step 8: Choose the Color of the Line__

Afterward, click on the horizontal line and choose your preferred color from the **Select Data Source** dialogue box.

__Step 9: Remove Markers of Horizontal Line__

Now, use the instructions mentioned in **Step 7 of Method 1**.

Congratulations! You have successfully added a horizontal line to the **Scatter Plot**.

**Read More:** **How to Create a Scatter Plot in Excel with 3 Variables (with Easy Steps)**

## How to Add a Vertical Line to a Scatter Plot in Excel

**Adding a vertical line** is almost similar to our **2nd Method** (anchor). There is only a negligible difference while inserting data in the **Edit Series** dialogue box.

In the following data set, we have **Sales **data for 10 **Days**. We are going to add a vertical line in the **Scatter Plot** using this data set.

- Follow
**Step 1 of Method 1**.

- Repeat the instructions mentioned in
**Step 2 of Method 1**.

- Redo
**Step 3 of Method 1**.

- Now, follow the instructions mentioned in
**Step 4 of Method 2**.

- Use these instructions from
**Step 5 of Method 2**.

- Now, in the
**Edit Series**dialogue box, first, insert the name of the series in the**Series name**box. We are using the name**Vertical Line**here. - Then, insert the
**Series X values:**box, insert the start point and end point of the X value for our horizontal line. Here it is**= {6,6}**. - After that, in the
**Series Y values:**box, insert the start point and the end point of the Y value for our horizontal line. In this case, it is**= {1,345}**. - Next, press
**OK**.

- Afterward, select
**OK**from the**Select Data Source**dialogue box

At this stage, you will be able to see the vertical line in your **Scatter Plot**.

## Things to Remember

- While selecting data in the
**Method 1**, you must include the extra column you added to the selection. - In this step of
**Method 2**, make sure that you click on the empty space on the chart.

## Conclusion

Finally, we have come to the very end of the article. I sincerely hope that this article will e able to help you with adding horizontal lines to an Excel **Scatter Plot**. Please feel free to leave a comment if you have any queries or recommendations for improving the articleâ€™s quality. To learn more about Excel you can visit our website **ExcelDemy**. Happy learning!

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