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How accurate is the GMAT score calculator?
From what I've heard and seen, the GMAT calculator is fairly accurate. The challenge lies in the fact that you can change your score prediction with your "ability under pressure" and that even your practice tests aren't always accurate. But since the calc has been out, there has been a huge update of data that has been put into the sytem by users just like yourself, and I personally believe it has become even more accurate over the past few months (especially with Kaplan). It guessed within 10 pts of my actual score compared to my final practice test with Kaplan.
For the most accurate prediction of test day score, I would take the GMATprep tests from mba.com. They use the real GMAT algo. But obviously you have to set aside 3.5 hours. But if you are looking for a solid guestimate, probably within plus or minus 30pts, the GMAT calc is awesome! A great tool, and something unique to the GMATclub
Good luck to you!