Return a range from A1 to the true last used cell

You need to make these mods to the code

1. The sheet may be blank, so you should never use Select with Find as this will give an error if the Find returns nothing. Instead test that the range object Is Not Nothing
2. Find can search by row and by column. You need to determine both last row and column to determine the true last used cell
3. Once you have determined the true last cell use Range to set a range from the first cell (A1) to your cell determined with the two Find ranges

Pls see the code below

If the Find gets a value then it makes a range rng3 from A1 to the last used cell identified by the two Finds.

Sub GetRange()
    Dim rng1 As Range
    Dim rng2 As Range
    Dim rng3 As Range
    Set rng1 = Cells.Find("*", [a1], xlFormulas, , xlByRows, xlPrevious)
    Set rng2 = Cells.Find("*", [a1], xlFormulas, , xlByColumns, xlPrevious)
    If Not rng1 Is Nothing Then
        Set rng3 = Range([a1], Cells(rng1.Row, rng2.Column))
        MsgBox "Range is " & rng3.Address(0, 0)
        'if you need to actual select the range (which is rare in VBA)
        Application.Goto rng3 
    Else
        MsgBox "sheet is blank", vbCritical
    End If
End Sub