Hello,

You can try this:

void xamDataGrid1_Loaded(object sender, RoutedEventArgs e)

        {

            CellValuePresenter cvp = CellValuePresenter.FromRecordAndField(xamDataGrid1.Records[0] as DataRecord, xamDataGrid1.FieldLayouts[0].Fields[0]) as CellValuePresenter;

            MessageBox.Show(cvp.Field.CellHeightResolved.ToString());

            DataRecordPresenter drp = DataRecordPresenter.FromRecord(xamDataGrid1.Records[0]) as DataRecordPresenter;

            MessageBox.Show(drp.ActualHeight.ToString());

        }