Just right-click on a cell that contains a decimal or a row or column full of such cells and select Format Cells. Select the source data and click Insert PivotTable. If you want to calculate a percentage of a number in Excel simply multiply the percentage value by the number that you want the percentage of.
This formula divides the value in cell A1 by the value in cell B1.
You can also choose the number of decimal points youd like in each percentage. In column C we want to know the percentage that each month contributed to the total. Summary To calculate percent of a total ie. Ill show you how to use this to make quick work of calculating a column of percentages.