Current Wechsler (WAIS–IV, WISC–IV, WPPSI–IV) IQ classification
| IQ Range ("deviation IQ") | IQ Classification |
|---|
| 130 and above | Very Superior |
|---|
| 120–129 | Superior |
|---|
| 110–119 | High Average |
|---|
| 90–109 | Average |
|---|
| 80–89 | Low Average |
|---|
| 70–79 | Borderline |
|---|
| 69 and below | Extremely Low |
|---|
Psychologists have proposed alternative language for Wechsler IQ classifications.[SUP]
[30][/SUP][SUP]
[31][/SUP]
Note especially that the term "borderline", which implies being very close to being intellectually disabled, is replaced in the alternative system by a term that doesn't imply a medical diagnosis.
| Corresponding IQ Range | Classifications | More value-neutral terms |
|---|
| 130+ | Very superior | Upper extreme |
|---|
| 120–129 | Superior | Well above average |
|---|
| 110–119 | High average | High average |
|---|
| 90–109 | Average | Average |
|---|
| 80–89 | Low average | Low average |
|---|
| 70–79 | Borderline | Well below average |
|---|
| 69 and below | Extremely low | Lower extreme |
|---|
Stanford-Binet Intelligence Scale Fifth Edition
Main article:
Stanford-Binet Intelligence Scales
The current fifth edition of the Stanford-Binet scales (SB5) was developed by Gale H. Roid and published in 2003 by Riverside Publishing.[SUP]
[24][/SUP] Unlike scoring on previous versions of the Stanford-Binet test, SB5 IQ scoring is deviation scoring in which each standard deviation up or down from the norming sample median score is 15 points from the median score, IQ 100, just like the standard scoring on the Wechsler tests.
| IQ Range ("deviation IQ") | IQ Classification |
|---|
| 145–160 | Very gifted or highly advanced |
|---|
| 130–144 | Gifted or very advanced |
|---|
| 120–129 | Superior |
|---|
| 110–119 | High average |
|---|
| 90–109 | Average |
|---|
| 80–89 | Low average |
|---|
| 70–79 | Borderline impaired or delayed |
|---|
| 55–69 | Mildly impaired or delayed |
|---|
| 40–54 | Moderately impaired or delayed |
|---|
Woodcock-Johnson Test of Cognitive Abilities
Main article:
Woodcock–Johnson Tests of Cognitive Abilities
The Woodcock-Johnson III NU Tests of Cognitive Abilities (WJ III NU) was developed by Richard W. Woodcock, Kevin S. McGrew and Nancy Mather and published in 2007 by Riverside.[SUP]
[24][/SUP] Note that the WJ III classification terms are not applied to the same score ranges as for the Wechsler or Stanford-Binet tests.
| IQ Score | WJ III Classification[SUP][34][/SUP] |
|---|
| 131 and above | Very superior |
|---|
| 121 to 130 | Superior |
|---|
| 111 to 120 | High Average |
|---|
| 90 to 110 | Average |
|---|
| 80 to 89 | Low Average |
|---|
| 70 to 79 | Low |
|---|
| 69 and below | Very Low |
|---|
Kaufman Tests
The Kaufman Adolescent and Adult Intelligence Test was developed by
Alan S. Kaufman and Nadeen L. Kaufman and published in 1993 by American Guidance Service.[SUP]
[24][/SUP] Kaufman test scores "are classified in a symmetrical, nonevaluative fashion",[SUP]
[35][/SUP] in other words the score ranges for classification are just as wide above the median as below the median, and the classification labels do not purport to assess individuals.
| 130 and above | Upper Extreme |
|---|
| 120–129 | Well Above Average |
|---|
| 110–119 | Above average |
|---|
| 90–109 | Average |
|---|
| 80–89 | Below Average |
|---|
| 70–79 | Well Below Average |
|---|
| 69 and below | Lower Extreme |
|---|
Main article:
Kaufman Assessment Battery for Children
The Kaufman Assessment Battery for Children, Second Edition was developed by Alan S. Kaufman and Nadeen L. Kaufman and published in 2004 by American Guidance Service.[SUP]
[24][/SUP]
| Range of Standard Scores | Name of Category |
|---|
| 131–160 | Upper Extreme |
|---|
| 116–130 | Above Average |
|---|
| 85–115 | Average Range |
|---|
| 70–84 | Below Average |
|---|
| 40–69 | Lower Extreme |
|---|
Cognitive Assessment System
Main article:
Cognitive Assessment System
The Das-Naglieri Cognitive Assessment System test was developed by Jack Naglieri and J. P. Das and published in 1997 by Riverside.[SUP]
[24][/SUP]
| Standard Scores | Classification |
|---|
| 130 and above | Very Superior |
|---|
| 120–129 | Superior |
|---|
| 110–119 | High Average |
|---|
| 90–109 | Average |
|---|
| 80–89 | Low Average |
|---|
| 70–79 | Below Average |
|---|
| 69 and below | Well Below Average |
|---|
Differential Ability Scales
Main article:
Differential Ability Scales
The Differential Ability Scales Second Edition (DAS–II) was developed by Colin D. Elliott and published in 2007 by Psychological Corporation.[SUP]
[24][/SUP] The DAS-II is a test battery given individually to children, normed for children from ages two years and six months through seventeen years and eleven months.[SUP]
[39][/SUP] It was normed on 3,480 noninstitutionalized, English-speaking children in that age range.[SUP]
[40][/SUP] The DAS-II yields a General Conceptual Ability (GCA) score scaled like an IQ score with the median standard score set at 100 and 15 standard score points for each standard deviation up or down from the median. The lowest possible GCA on the is DAS–II is 44, and the highest is 175.[SUP]
[41][/SUP]
| GCA | General Conceptual Ability Classification |
|---|
| ≥ 130 | Very high |
|---|
| 120–129 | High |
|---|
| 110–119 | Above average |
|---|
| 90–109 | Average |
|---|
| 80–89 | Below average |
|---|
| 70–79 | Low |
|---|
| ≤ 69 | Very low |
|---|
Reynolds Intellectual Ability Scales
Reynolds Intellectual Ability Scales (RIAS) were developed by Cecil Reynolds and Randy Kamphaus. The RIAS was published in 2003 by Psychological Assessment Resources.[SUP]
[24][/SUP]
| Intelligence test score range | Verbal descriptor |
|---|
| ≥ 130 | Significantly above average |
|---|
| 120–129 | Moderately above average |
|---|
| 110–119 | Above average |
|---|
| 90–109 | Average |
|---|
| 80–89 | Below average |
|---|
| 70–79 | Moderately below average |
|---|
| ≤ 69 | Significantly below average |
|---|
