Worksheet.Index Property (Excel)
Returns a Long value that represents the index number of the object within the collection of similar objects.
Syntax
expression .Index
expression A variable that represents a Worksheet object.
Example
This example displays the tab number of the sheet specified by the name that you type. For example, if Sheet4 is the third tab in the active workbook, the example displays "3" in a message box.
Sub DisplayTabNumber()
Dim strSheetName as String
strSheetName = InputBox("Type a sheet name, such as Sheet4.")
MsgBox "This sheet is tab number " & Sheets(strSheetName).Index
End Sub