I can not find a single published study correlating the LSAT with any other intelligence test although the data certainly exists. For example a 1985 study found a 0.72 correlation between LSAT and SATs in 5,854 students, though whether this study was ever published and where, I know not.

From 1948 to 1981, the LSAT was scored using a 200 to 800 point scale similar to the sub-scales of the SAT. Then from 1981 to 1991, it used a 48 point scale. Then starting in 1991, scores were expressed using a 120 to 180 scale. It is this latest version that I discuss in this article.

According to wikipedia: “Although the exact percentile of a given score will vary slightly between examinations, there tends to be little variance. The 50th percentile is typically a score of about 151; the 90th percentile is around 165 and the 99th is about 173. A 178 or better usually places the examinee in the 99.9th percentile.”

In other words, assuming a bellish curve, LSAT takers have an LSAT mean of about 152.1 and an SD of about 8.8.

Here’s a reddit thread where people listed their scores on both the LSAT and the ACT/SAT.

Because the SAT is constantly changing, I decided to focus on the LSAT-ACT correlation, ignoring the SAT.

The correlation between self-reported LSAT scores and ACT scores was +0.47 (n = 21).

Because I know a lot more about how SAT scores relate to IQ than I do about how ACT scores do, I converted all the ACT score to IQ using table A.1 from a 1999 paper by Neil J. Dorans:

The LSAT scores of the sample had a mean of 163 (SD 9.03) and the ACTs converted to SATs scores had a mean of 1307 (SD 161). Then using my formula for converting the post-April 1995 to pre-March 2016 SAT to IQ (IQ equivalent = 23.835 + 0.081(SAT score)) the sample had a mean IQ of 130 (SD 13).

Thus, the formula for equating LSAT to IQ (U.S.) norms:

IQ = [(LSAT – 163)/9.03](13) + 130

Recall that above we estimated LSAT takers have an LSAT mean of about 152.1 and an SD of about 8.8. So on the standard scale where Americans average IQ 100 with an SD of 15, the law school-bound elite average IQ 114 with an SD of 12.7, at least in the recent decades.