I want to be able to sum together the values of an entire row except for the first 2 cells. So something like this:
=sum(A3:A*infinity*)
How do I do this?
I want to be able to sum together the values of an entire row except for the first 2 cells. So something like this:
How do I do this? 


Something similar has been asked before and I'll repeat this answer: just put:
because that's the max number of cells per column / row in Office 2007 and 2010. (65536 is max for before 2007.) (For columns, the max column name is XFD in 2007 and 2010, and IV before 2007.) 


Add up everything and then take away the ones you don't want to include:
Edit: As josmh has pointed out, the formula above will fail with an error if A1 or A2 are non numeric  but the following will work:
or
or (for a bit of fun!)
These work because the SUM function ignores nonnumeric fields 

I thought you could simply do the following: =SUM(A3:A) 


To sum an entire row:
Replace 1 with your starting row number and then use the autofill handle accordingly. If you drag the formula down, it'll change to "=sum(2:2)" and so on.. To sum the entire row, except the first 2 columns:
This'll help you cut down on the file size. 


This already has several fine answers but here's a method I haven't yet seen posted:
The format is
The benefit of these formulas over the currently accepted answer is that they work in any version of excel. It also won't adjust the range if you insert cells in front because it's referencing the entire row / column. You may or may not want that functionality depending on your data setup. 


You can also select cells in a row or column by selecting the first cell and then pressing CTRL+SHIFT+ARROW key (RIGHT ARROW or LEFT ARROW for rows, UP ARROW or DOWN ARROW for columns). Note If the row or column contains data, CTRL+SHIFT+ARROW key selects the row or column to the last used cell. Pressing CTRL+SHIFT+ARROW key a second time selects the entire row or column. PS.


