COLUMN function
This article describes the formula syntax and usage of the COLUMNfunction in Microsoft Excel. Find links to more information about formatting columns in the See Also section.
Description
Returns the column number of the given cell reference. For example, the formula =COLUMN(D10) returns 4, because column D is the fourth column.
Syntax
COLUMN([reference])
The COLUMN function syntax has the following argument:

reference Optional. The cell or range of cells for which you want to return the column number.

If the reference argument is omitted or refers to a range of cells, and if the COLUMN function is entered as a horizontal array formula, the COLUMN function returns the column numbers of reference as a horizontal array.
To enter a formula as an array formula Starting with the formula cell, select the range that you want to contain the array formula. Press F2, and then press CTRL+SHIFT+ENTER.
Note In Excel Web App you cannot create array formulas.

If the reference argument is a range of cells, and if the COLUMN function is not entered as a horizontal array formula, the COLUMN function returns the number of the leftmost column.

If the reference argument is omitted, it is assumed to be the reference of the cell in which the COLUMN function appears.

The reference argument cannot refer to multiple areas.

Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?

Select the example in this article. If you are copying the example in Excel Online, copy and paste one cell at a time.
Important: Do not select the row or column headers.Selecting an example from Help

Press CTRL+C.

Create a blank workbook or worksheet.

In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Online, repeat copying and pasting for each cell in the example.
Important: For the example to work properly, you must paste it into cell A1 of the worksheet. 
To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

