It's frustrating and disorienting not to know how the Flex test will be scored. The LSAT is stressful enough without worrying about a new format.
But, the truth is, you've already been given the best converter in existence from the LSAC itself: the regular 4 section PrepTest. Take 4 section PTs. That will be the best predictor of how you will do on a 3 section Flex test. On test day, frame the loss of 1 LR section to yourself as a treat: 1 fewer stress inducing nerve-racking task to do.
We've debated creating a "Flex score converter" and a "Flex PT" and we've been hesitant to do so because we try to create only quality content, and a converter would be garbage.
The truth is that only LSAC can create a "Flex score converter" or a "Flex PT." LSAC has not given any significant details on how they will score LSAT Flex. Anything we try to do on that front will necessarily be guesswork and misleading.
Having said that, we made this "Flex Score Estimator" based on requests by students to see what their score would be if LR, RC, and LG were weighted the same. Feel free to play around with it and don’t take it seriously!