Ok. Here is what I would like to do. I would like the ability for a user to enter their % complete in a cell and once that reaches 100% the check box will auto check. I would also like them to be able to click the completed box and have the % complete cell fill in with 100%. How I want to accomplish this is by using a couple of hidden columns. I just haven't been able to find the formula that I would put in column A to update column B when something is entered in Column C.