IQ Scores
Classification, comparisons, estimation, hoaxes and distribution

Measured Intelligence and Education

Best Estimate of IQ Differences for Adults in Different Occupations

WAIS CLASSIFICATION,  %ile in the general population 
descriptions,         |         standard deviation 
High-IQ societies,    |         |    IQ SD-15 - WAIS, WISC 
v = "here and down"   |         |    |   SD=16 - Binet, CTMM, Otis-Lennon 
                      |         |    |   | 
PROFOUND RETARD.---v  .13e-8    |    00 -07  IQ SD-23.7 - Cattell (Verbal) 
SEVERE RETARD.-----v  .29e-4  -5.00  25  20  |   SAT Verbal 
MODERATE RETARD.---v  .0031   -4.00  40  36  |   |   GRE Verbal 
MILD RETARD.-------v  .13     -3.00  55  52  |   |   |   Miller Analogies 
BORDERLINE RETARD.-v 2.3      -2.00  70  68  |   |   |   |   SAT (old) Verbal+Math 
DULL-NORMAL--------v 9.1      -1.33  80  79  |   |   |   |   |   ACT Composite**
AVERAGE------------v25.0      -0.68  90  89  |   |   |   |   |   | 
general pop. ave.---50.0       0.00 100 100 100 340  |   |   |   | 
high sch. grad ave.-60.0      +0.25 104 104 106 370  |   |  790 19
                    70.0       0.53 108 108 112 410  |   |  860 21
BRIGHT-NORMAL------v75.0       0.68 110 111 116 430  |   |  910 22
                    80.0       0.83 112 113 120 450 420  |  940 
college grad ave.---84.1       1.00 115 116 124 470 440 38  980 23
                    90.0       1.29 119 120 130 500 470 43 1040 24
SUPERIOR-----------v9l.O       1.33 120 121 132 510 480 44 1060 25
                    93.0       1.47 121 122 135 530 500 47 1100 26
Ph.D. & M.D. ave.---95.0       1.63 125 126 139 550 530 52 1150 27
                    97.0       1.87 128 130 145 580 580 60 1190 28
VERY SUPERIOR------v97.8       2.00 130 132 147 590 600 65 1220
Mensa,  Camelopard-v98.0       2.06 131 133 149 600 610 66 1230 29
Intertel, TOPS-----v99.0       2.33 135 137 155 640 670 74 1310 31
Poetic Genius------v99.5       2.57 139 141 161 670 710 81 1360 32
                    99.7       2.74 141 144 165 690 730 84 1390 
                    99.8       2.88 143 146 168 710 740 86 1420 33   
ISPE, TNS----------v99.9       3.09 146 149 173 730 760 89 1450 34
                    99.95      3.29 149 153 178 750 780 91 1480 35
                    99.97      3.43 151 155 182 760 790 92 1500 
WAIS-III ceiling    99.98      3.54 153 157 184 770 800 93 1510
(IQ 155)            99.99      3.73 156 159 188 780     94 1530 
                    99.995     3.90 158 162 192 790     95 1540 
Prometheus---------v99.997     4.02 160 164 195 800     96 1550 
                    99.998     4.10 162 166 197         97 1560 
                    99.999     4.27 164 168 201         98 1570 
                    99.9995    4.42 166 171 205            1580 
                    99.9997    4.53 168 172 207                 
                    99.9998    4.61 169 174 209            1590 
Mega---------------v99.9999    4.75 171 178 212            1600 36
                    99.99995   4.89 173 178 216 
                    99.99997   5.00 175 180 218                 
                    99.99998   5.07 176 181 220 
                    99.99999   5.20 178 183 223                 
                    99.999995  5.33 180 185 226 
                    99.999997  5.42 181 187 228                 
                    99.999998  5.50 182 188 230 
                    99.999999  5.61 184 190 233                
                    99.9999995 5.73 186 192 236 
                    99.9999997 5.82 187 193 238                 
                    99.9999998 5.88 188 194 239 
                    99.9999999 6.00 190 196 242 

*Source
The International Society for Philosophical Enquiry

**Approximate SAT/ACT correlations based on data provided by The College Board in the following tables:
 ACT/SAT I Score Comparisons and SAT (old) vs. SAT I Score Comparisons.

NOTE: The above correlations are approximate. For actual test scores accepted for ISPE admission,
 please consult the ISPE Information page