Sub ConvertFormulas()
Dim sht As Worksheet
Dim rngCell As Range
Set sht = ActiveSheet
Application.Calculation = xlCalculationManual
For Each rngCell In sht.UsedRange.SpecialCells(xlCellTypeFormulas).Cells
rngCell.Formula = Application.ConvertFormula(rngCell.Formula, xlA1, , xlAbsolute)
Next rngCell
Application.Calculation = xlCalculationAutomatic
End Sub