Summing values in Table

I have a table with some calculated values in a column. It a simple math equation:
I’m displaying the results of {{Unit Price * Units)}} in a cell in every row.

I saw the video where you can sum dynamic values in a table and that works great

But is there a way I can sum all of my calculated fields in that table? Unlike the video, the values I want to sum are calculated in each row So like this:
Row1 cell {{UnitpriceUnits}}
Row2 cell {{UnitpriceUnits}}
Row3 cell {{Unitprice*units}}

sum of row 1,2,3 = Grand Total.

Would this be better done in a query?

Thanks,
Chris