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If the relationship between two variables is quadratic, then you can use a quadratic trendline to capture their relationship in a plot.

This tutorial provides a step-by-step example of how to add a quadratic trendline to a scatterplot in Excel.

**Step 1: Create the Data**

First, let’s create some data to work with:

**Step 2: Create a Scatterplot**

Next, highlight cells **A2:B17**. Click the **Insert** tab along the top ribbon, then click the first chart option under **Insert Scatter** in the **Charts** group.

The following scatterplot will automatically be displayed:

**Step 3: Add the Quadratic Trendline**

Next, click the green plus “**+**” sign in the top right corner of the plot. Click the arrow to the right of **Trendline**, then click **More Options**.

In the window that appears to the right, click **Polynomial** and select **2** for Order:

The following quadratic trendline will automatically be displayed on the chart:

Feel free to click on the trendline itself to change the style or color.

**Additional Resources**

How to Perform Quadratic Regression in Excel

Curve Fitting in Excel (With Examples)