You can sum cells across multiple sheets in Excel. This article presents steps for Adding single-cell values or Adding values in the range of cells.

A complex Excel 2007 workbook could require multiple sheets. By default, Microsoft provides three sheets on each workbook, but you can add as many as you need. Clicking the "Insert Worksheet ...

An Excel file, called a workbook, is composed of multiple worksheets. If you want to add a header or footer to all sheets, select every sheet by right-clicking one of the sheet tabs at the bottom ...