I think you're better off using the actual PSAT percentile charts to estimate your IQ. Once you have the percentile, you can go to any percentile-to-IQ conversion chart and find a number. The chart you linked is accurate as far as it goes, but doesn't include any of the measures you actually have taken. Practice test scores aren't particularly reliable (a lot of people have fairly different scores on test day).

For the PSAT percentile chart, make sure you are comparing yourself to the correct grade level (I made an assumption about your grade level at time of testing, which may or may not have been accurate), and to the national norms, not the user norms. The user norms are a slightly more selective population than the national norms. Oh, also these percentiles are for the spring 2016 test, which apparently was slightly less selective than the fall 2015 test for which you sat. But the national norms are the ones you want, anyway.

On the ACT: yes. As with the user vs national norms of the PSAT, the user norms are more selective.

And FYI, the 97th %ile on most cognitive assessments is about 128.

Last edited by aeh; 08/22/18 12:00 PM.

...pronounced like the long vowel and first letter of the alphabet...