How to Calculate a Running Total in Excel Learn to create cumulative sums in Microsoft Excel with these step-by-step instructions and screenshots.

If you're planning to have employees log their own time in spreadsheets and submit them as timesheets with a built-in time calculator in Excel, using separate spreadsheets may be the easiest solution.

To calculate in Excel how many hours someone has worked, you subtract the start time from the end time — the difference is the hours worked.

Fortunately, Excel offers a built-in function, DATEDIF, which makes it easy to calculate elapsed calendar time.