In this tutorial, we learn how to calculate and add running percentages in Excel. First, write out your value and percentage into the different columns. Next, write the formula in the cell where you want the answer to appear. To have the answer appear, highlight the box and drag it down, then the answers will start to appear in each of the different columns for the different equations. This is an extremely simple way to calculate these percentages without having to do any math! As long as you know how to write in the equation of what you are trying to figure out, you can get this done easily without hassle.