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So, in this case, 270,000 Marriott points are approximately equivalent to 100,000 SPG points. With SPG, you get 5,000 more miles, but with Marriott you get a 7 night stay. If we ignore the differences, we can say that we would need 2.7 Marriott points per SPG point in order to break even.
In summary, if you have less than 100,000 SPG points that you want to transfer to airline miles, Marriott would have to convert SPG points 1 to 3.5 (or more) to Marriott points to keep you âwholeâ.