Automatic SUM Recalculation

[Zip_Allen]

I'm an Excel novice.  How do I turn on automatic SUM recalculation, when a value within the SUM range changes?  Currently, I have to click on the SUM field to get it to recalculate.

Thanks for the help !

[#2]

@Zip_Allen 

Be sure Calculation option is in automatic mode. That is for Windows, something similar shall be for Mac

[#3]

@Zip_Allen 

Make sure that Calculation Options on the Formulas tab of the ribbon is set to Automatic, and that you don't have circular references.

[#4]

Thank you ! That did it! I really appreciate the quick response.