How to convert Excel column numbers into alphabetical characters


This article discusses how to use the Microsoft Visual Basic for Applications (VBA) function in Microsoft Excel to convert column numbers into their corresponding alphabetical character designator for the same column.

For example, the column number 30 is converted into the equivalent alphabetical characters "AD".

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The ConvertToLetter function works by using the following algorithm:
  1. Divide the column number by 27, and then put the resulting integer in the variable "i".
  2. Subtract the column number from "i" multiplied by 26, and then put the result in the variable "j".
  3. Convert the integer values into their corresponding alphabetical characters, "i" and "j" will range from 0 to 26 respectively.
For example: The column number is 30.
  1. The column number is divided by 27: 30 / 27 = 1.1111, rounded down by the Int function to "1".
    i = 1
  2. Next Column number - (i * 26) = 30 -(1 * 26) = 30 - 26 = 4.

    j = 4
  3. Convert the values to alphabetical characters separately,

    i = 1 = "A"
    j = 4 = "D"
  4. Combined together, they form the column designator "AD".
The following VBA function is just one way to convert column number values into their equivalent alphabetical characters:
Function ConvertToLetter(iCol As Integer) As String
Dim iAlpha As Integer
Dim iRemainder As Integer
iAlpha = Int(iCol / 27)
iRemainder = iCol - (iAlpha * 26)
If iAlpha > 0 Then
ConvertToLetter = Chr(iAlpha + 64)
End If
If iRemainder > 0 Then
ConvertToLetter = ConvertToLetter & Chr(iRemainder + 64)
End If
End Function
Note This function only converts integers that are passed to it into their equivalent alphanumeric text character. It does not change the appearance of the column or the row headings on the physical worksheet.

Artikel-id: 833402 – senaste granskning 15 feb. 2017 – revision: 3

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