how do i calculate time on excel
Setting Cells to Have the [h]:mm Format: 1  Right click on the cell to be formatted. 2  Select the option Format Cells... 3  Ensure the Number tab is selected in the window that pops up. 4  Select the option Custom from the list of Categories and type [h]:mm into the box on the right. 5  Click OK.ell B3 of the following spreadsheet shows a simple example of how to calculate a time difference in Excel. The calculation simply subtracts the time in cell B1 from the time in cell B2.