How to autonumber rows if adjacent cell not blank in Excel?

In Excel, we can drag the fill handle to fill the sequence numbers in a column quickly and easily, but, sometimes, we need to number the rows based on adjacent cells. For example, if the cells contain value then number them, if there are blank cells, leave the sequence blank as well. How could you solve this job that when you insert or delete values in adjacent cells, the column can be renumbered automatically as following screenshot shown?

Number rows if adjacent cell not blank automatically with formula

Number rows if adjacent cell not blank automatically with formula

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To solve this task, here, I will introduce a simple formula, please do as follows:

1. Enter this formula: =IF(B2<>"",COUNTA($B$2:B2),"") into a blank cell which adjacent your data cell, A2, for instance, and then drag the fill handle down to the cells that you want to apply this formula to auto number the column based on adjacent cells, see screenshot:

Note: In the above formula, B2 is the cell that you want to auto number based on.

2. And now, when entering value in the blank cells or deleting the existing data, the sequence numbers in column A will be renumbered automatically.

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