Converting LSAT scores to IQ’s

Posted on 8 January 2009

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I decided to use a linear regression analysis to convert LSAT scores to IQ’s. I found five data points from five high-IQ societies that accept LSAT scores. The International Society for Philosophical Inquiry accepts a 178 LSAT score, which corresponds to a 146 IQ. The Poetic Genius Society accepts a 174 LSAT score, which corresponds to a 139 IQ. Intertel accepts a 172 LSAT Score, which corresponds to a 135 IQ; and Mensa America accepts a LSAT score that is in the 95th percentile, which is historically a 167 LSAT Score corresponding to a 130 IQ. I’m assuming a 15 SD for all IQ scores. The LSAT average is historically between 150-151. I’ll choose 151 to be generous. Inductivist calculated that the average college graduate’s IQ is a 105. So the last data point is a 151 LSAT score corresponding to a 105 IQ.

My slope is 1.4891, which I’ll round to 1.49, and my y-value is -119.7679, which I’ll round to -119.77. The resulting equation is IQ = LSAT*1.49 – 119.77. Here is an incomplete chart; the decimal points don’t convey greater accuracy:

180     146+

179     146+

178     146

177     143.8

176     142.3

175     140.8

174     139

173     137.8

172     135

171     134.8

170     133.4

169     132

168     130.4

167     130

166     127.4

165     126

164     124.4

163     123

162     121.5

161     120

160     118.5

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Posted in: IQ, LSAT