Calc is OpenOffice.org's spreadsheet application. Create a new spreadsheet with ‘File’+‘New’+‘Spreadsheet’ or open one with ‘File’+‘Open’. Calc can read and save in Microsoft Excel's format.

In the spreadsheet cells, enter fixed data or formulas. A formula can manipulate data from other cells to generate a value for the cell in which it is inserted. You can also create charts from cell values.