Sharepoint formula problem

Shah1827 Not sure what you are trying to calculate, but here are some references for sharepoint calculated columns:

https://support.microsoft.com/en-us/office/examples-of-common-formulas-in-sharepoint-lists-d81f5f21-2b4e-45ce-b170-bf7ebf6988b3 

https://docs.microsoft.com/en-us/previous-versions/office/developer/sharepoint-2010/bb862071(v=office.14) 

https://natechamberlain.com/2018/08/27/extract-date-components-using-the-text-function-in-sharepoint-calculated-columns/ 

But yes, your column must be of type "Calculated" if you want a value derived from a formula. It can't be Single Line of Text.