How to perform simple math functions on a view in a SharePoint list or library

Data can be calculated in a variety of ways using formulae and functions in lists or libraries. You can develop a formula that uses information from other columns and executes functions to calculate dates and timings, solve mathematical equations, or edit text by adding a calculated column to a list or library. For instance, based on the Start Date and Date Completed columns on a tasks list, you may use a column to determine how many days it takes to accomplish each activity.

More Information about SharePoint Formulas

• Introduction to SharePoint formulas and functions
  https://support.microsoft.com/en-us/office/introduction-to-sharepoint-formulas-and-functions-94e1b4cc-cd1c-49c2-80ec-90c9b9591f47
• Calculate data in lists or libraries
  https://support.microsoft.com/en-us/office/calculate-data-in-lists-or-libraries-c5261743-667f-4833-bede-e516cef2a0e1