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Often you may have one or more missing values in a series in Excel that you’d like to fill in.

The simplest way to fill in missing values is to use the **Fill Series** function within the **Editing** section on the **Home** tab.

This tutorial provides two examples of how to use this function in practice.

**Example 1: Fill in Missing Values for a Linear Trend**

Suppose we have the following dataset with a few missing values in Excel:

If we create a quick line chart of this data, we’ll see that the data appears to follow a linear trend:

To fill in the missing values, we can highlight the range starting before and after the missing values, then click **Home > Editing > Fill > Series**.

If we leave the Type as **Linear**, Excel will use the following formula to determine what step value to use to fill in the missing data:

Step = (End – Start) / (#Missing obs + 1)

For this example, it determines the step value to be: (35-20) / (4+1) = **3**.

Once we click **OK**, Excel automatically fills in the missing values by adding 3 to the each subsequent value:

**Example 2: Fill in Missing Values for a Growth Trend**

Suppose we have the following dataset with a few missing values in Excel:

If we create a quick line chart of this data, we’ll see that the data appears to follow an exponential (or “growth”) trend:

To fill in the missing values, we can highlight the range starting before and after the missing values, then click **Home > Editing > Fill > Series**.

If we select the Type as **Growth** and click the box next to **Trend**, Excel automatically identifies the growth trend in the data and fills in the missing values.

Once we click **OK**, Excel fills in the missing values:

From the plot we can see that the filled-in values match the general trend of the data quite well.

*You can find more Excel tutorials here.*