VB Code to Automatically Set Min and Max Scale for Y- Axis

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Type the following in a Visual Basic module sheet:

   Sub SetScaleToMinAndMaxValues()
      Dim ValuesArray(), SeriesValues As Variant
      Dim Ctr As Integer, TotCtr As Integer

      ' Uses the first chart on the active worksheet.
      With ActiveSheet.ChartObjects(1).Chart

         ' Note: Instead of the preceding line, you could use this line:
         '
         '    With ActiveChart
         '
         ' if you wanted to be able to run this macro on a chart sheet.

         ' Loops through all of the Series and retrieves the values
         ' and places them into an array named ValuesArray.
         For Each X In .SeriesCollection
            SeriesValues = X.Values
            ReDim Preserve ValuesArray(1 To TotCtr + UBound(SeriesValues))
            For Ctr = 1 To UBound(SeriesValues)
               ValuesArray(Ctr + TotCtr) = SeriesValues(Ctr, 1)

               ' In Excel 97 for Windows and Excel 98 Macintosh Edition,
               ' change the preceding line of code to read as follows:
               '
               '    ValuesArray(Ctr + TotCtr) = SeriesValues(Ctr)

            Next
            TotCtr = TotCtr + UBound(SeriesValues)
         Next

         ' Reset the minimum and maximum scale to the minimum and
         ' maximum values in the ValuesArray.
         .Axes(xlValue).MinimumScaleIsAuto = True
         .Axes(xlValue).MaximumScaleIsAuto = True
         .Axes(xlValue).MinimumScale = Application.Min(ValuesArray)
         .Axes(xlValue).MaximumScale = Application.Max(ValuesArray)
      End With
   End Sub
				

Using the Macro

1. Select the worksheet that contains your chart.
2. To activate the macro, click Macro on the Tools menu, and run the SetScaleToMinAndMaxValues macro.
   
   In Excel 97 and Excel 98, click Tools, point to Macro, and then click Macros. Click SetScaleToMinAndMaxValues, and then click Run.

The minimum and maximum values of the y-axis should now be equal to the minimum and maximum values of the data.