XLplus Add-On: Column Translator
This XLplus Add-Ons informs about Columns. You can enter a Column Number and obtain its equivalent labeling or vice versa.
Use 
to get the last possible Excel Column either as label or number.
Use 
to get the equivalent of a given Column Number or Label.
Use 
to copy the Column Label or Number to the Clipboard. You can paste this data into your active sheet or formula.
Note: You can use Toggle Cell Reference Style to show columns as numbers within your worksheet. Alternatively, use the Shortcut [Ctrl]+[Shift]+R.