This example converts a SUM formula that contains R1C1-style references to an equivalent formula that contains A1-style references, and then it displays the result.
inputFormula = "=SUM(R10C2:R15C2)"
MsgBox Application.ConvertFormula( _
formula:=inputFormula, _
fromReferenceStyle:=xlR1C1, _
toReferenceStyle:=xlA1)