# COLUMN Function in Excel

Returns the column number of a given cell reference

Returns the column number of a given cell reference

The COLUMN function in Excel is a Lookup/Reference function. This function is useful for looking up and providing the column number of a given cell reference. For example, the formula =COLUMN(A10) returns 1, because column A is the first column.

**=COLUMN([reference])**

The COLUMN function uses only one argument, that is reference, which is an optional argument. It is the cell or a range of cells for which we want the column number. The function will give us a numerical value.

Few points to remember for the reference argument:

- Reference can be a single cell address or a range of cells.
- If not provided by us, then it will default to the cell in which the column function exists.
- We cannot include multiple references or addresses as reference for this function

It is a built-in function that can be used as a worksheet function in Excel. To understand the uses of the COLUMN Function in Excel, let’s consider a few examples:

Suppose we are given the following references:

In the first reference that we’ve provided, we did not give a reference so it gave us the result 4 with the COLUMN function in cell C5, as shown in the screenshot below:

When we used the reference B6, it returned the result of 3 as the column reference was B.

As you can see above, when we provide an array, the formula returned a result of 2.

Using it with other Excel functions. Suppose a flower expense that is payable every third month. So, the flower expense is $100 and if we wish to generate a fixed value every third month, we can use a formula based on the MOD function.

The formula used is =IF(MOD(COLUMN(B8)-1,3)=0,$A$2,0), as shown below:

So, in the example above, we took a recurring expense at every 3 months. If we wish to get it let say once in 2 months, then we will change the formula to:

=IF(MOD(COLUMN(B19)-1,2)=0,$A$4,0)

The formula can also be used for a fixed expense every regular time interval, a fixed payment let say every 6 months such as premiums, etc.

Here, two formulas are used: MOD and COLUMN. MOD is the main function used. The function is useful for formulas that are required to do a specified act every nth time. Here, in our example, the number was created with the COLUMN function, which returned the column number of cell B8, the number 2, minus 1, which is supplied as an “offset.” Why did we use an offset? It is because we wanted to make sure that Excel starts counting at 1, regardless of the actual column number.

The divisor is fixed as 3 (flower expense) or 2, since we want to do something every 3^{rd} or 6^{th} month. By testing for a zero remainder, the expression will return TRUE at the 3^{rd} , 6^{th} , 9^{th} , and 12^{th} months or at the 2^{nd}, 4^{th}, 6^{th}, 8^{th}, 10^{th} and 12^{th} month:

As shown in the screenshot below, we can we use a date instead of using a text value as we’ve used now for months. This will help us in building a more rational formula. All we need to do is adjust the formula to extract the month number and use that instead of the column number:

=IF(MOD(MONTH(A19),3)=0,$A$4,0)

If we want, we can use this column function to get the sum of every nth column. Suppose we are given the following data:

As we wish to sum every nth column, we used a formula combing three Excel functions: SUMPRODUCT, MOD, and COLUMN.

The formula used is:

=SUMPRODUCT(–(MOD(COLUMN(B4:F4)-COLUMN(B4)+1,G4)=0),B4:F4)

Let us see how the COLUMN Function in Excel works.

In the formula above, Column G is the value of n in each row. Using the MOD function will return the remainder for each column number after dividing it by N. So, for example, when N = 3, MOD will return something like this:

{1,2,0,1,2,0,1,2,0}

So, the formula uses =0 to get TRUE when the remainder is zero and FALSE when it is not. Note that we used a double-negative (–) to get TRUE or FALSE to ones and zeros. It gives an array like this:

{0,0,1,0,0,1,0,0,1}

Where 1s now indicate “nth values.” It goes into SUMPRODUCT as array1, along with B5:F5 as array2. Now SUMPRODUCT multiplies and then adds the products of the arrays.

So, the only values that last multiplication are those where array1 contains 1. In this way, we can think of the logic of array1 “filtering” the values in array2.

Click here to download the sample Excel file

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