That's Backwards.

Figure out how much you are going to save by subtracting payment for points scenario from scenario with no points and multiply that number by the number of months you plan on stying in the home.

(payment for scenario with no points)-(payment for scenario with points)=monthly savings

(monthly savings)x(#of months planning on staying in loan)=total saved

If the total saved is greater than the origination (points), you're golden. If it's not a very big savings, reevaluate.......