You can sum a series of numbers in Microsoft Excel manually by typing in a simple formula, or automatically with a tool.

To calculate or analyze a large amount of data or numbers, you can use the built-in functions such as sum, count, average, max, min, and so on. Basic Calculations in Excel – Addition ...

How to calculate CPI in Excel To calculate the Consumer Price Index between two years in Excel, take a sum of all the amounts spent on the basket of products over those two years.

You can't use a SUM() function to sum a filtered list, unless you intend to evaluate hidden and unhidden values. Here's how to sum only the values that meet your filter's criteria.