I would like to count the amount of points that are out of the polygon because I need to sum them.
I know how to count how many points are inside but in need to find how many there are outside.
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A simple method for counting only would be to use
select by location in vector menu and select points inside that polygon. Then open the attribute table of your points layer and reverse selection. You can see the amount of selected points at the top of attribute table.
If you need to unselect points inside more than one polygon you can use
add to current selection instead of
create new selection in
select by location menu.
But of course you can not store that information in a (not existing) polygons attribute table as you could by using
count points inside polygon.