Before you add any calculations or checkboxes, you need to tell Excel that certain columns (in my case, columns D, F, and G) will output a time by changing the data type for these cells.

Learn how to add, configure and use checkboxes in Excel to create interactive task lists and trigger formatting without relying on macros.

Tgood37 asked the Answer Line forum how to add checkboxes to Excel spreadsheets, and make sure that checking a box will have an effect.