You can convert daily data to weekly data in Excel by creating a pivot table, and grouping the rows in the pivot table in groups of seven days, or one week.

3. Convert to formulas. Finally, position your cursor in the PivotTable you want to convert, and from the PivotTable Tools menu, select Analyze, OLAP Tools, Convert to Formulas, as pictured below.

Learn how to import or export data from a Text file to convert a Text (.txt or .csv) file into an Excel (.xlsx) spreadsheet easily using this procedure.