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<p>I’m not sure they “convert” at all. I should think each school has its own target ACT and SAT ranges, with separate targets for each test based on the stats of the students they’ve been able to get in the past. Their sensitivity to test scores might also be a little different on each test, based, for example, on how it will affect their US News ranking.</p>
<p>Bottom line, if your test scores are equally strong on both tests, it probably can’t hurt and conceivably could help to submit both sets of scores.</p>