Refresh Excel VBA Function Results

You should use Application.Volatile in the top of your function:

Function doubleMe(d)
    Application.Volatile
    doubleMe = d * 2
End Function

It will then reevaluate whenever the workbook changes (if your calculation is set to automatic).

Some more information on the F9 keyboard shortcuts for calculation in Excel

F9 Recalculates all worksheets in all open workbooks
Shift+ F9 Recalculates the active worksheet
Ctrl+Alt+ F9 Recalculates all worksheets in all open workbooks (Full recalculation)
Shift + Ctrl+Alt+ F9 Rebuilds the dependency tree and does a full recalculation

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