WISC-V Explained: A Parent's Guide to the Scores

What the WISC-V Is

The WISC-V is the fifth edition of a test David Wechsler first published in 1949. Earlier editions followed in 1974, 1991 and 2003; Pearson released the current one in 2014. An examiner gives it one-to-one, either with paper materials or digitally through Pearson's Q-interactive system.

Pearson normed the test on 2,200 children, 100 boys and 100 girls at each age from 6 through 16. That sample is the yardstick. Every score on your child's report says how he or she performed against children of the same age in that group, not against adults and not against classmates.

The test is not a school exam and not a diagnosis. It samples how a child reasons, remembers and works under time pressure on one day. For the wider picture of how such tests are built, see how IQ is measured and the history of the IQ test.

The 10 Primary Subtests

Pearson groups the subtests into five domains. Two primary subtests feed each primary index. The seven marked FSIQ produce the Full Scale IQ. The descriptions below cover format only; the items themselves are confidential and copyrighted.

Six secondary subtests can substitute or extend: Information, Comprehension, Arithmetic, Picture Concepts, Letter-Number Sequencing and Cancellation. Five complementary subtests, new in this edition, measure naming speed and the learning and recall of new symbol associations: Naming Speed Literacy, Naming Speed Quantity, and three Symbol Translation tasks (immediate, delayed and recognition). They do not enter the IQ.

Thirteen Index Scores and One Headline Number

The WISC-V can report 13 indexes in three tiers. The five primary indexes are Verbal Comprehension, Visual Spatial, Fluid Reasoning, Working Memory and Processing Speed. The five ancillary indexes are Quantitative Reasoning, Auditory Working Memory, Nonverbal, General Ability and Cognitive Proficiency. The three complementary indexes are Naming Speed, Symbol Translation and Storage and Retrieval.

Two ancillary scores matter to many families. The General Ability Index (GAI) sets aside working memory and processing speed and leans on reasoning and knowledge. The Cognitive Proficiency Index (CPI) does the reverse. A large gap between them tells the examiner that speed or memory, not reasoning, is pulling the Full Scale IQ down.

Independent reviewers urge caution with the indexes. In a 2016 review chapter that reanalyzed the standardization sample's subtest correlations, psychologists Gary Canivez and Marley Watkins found that general intelligence accounted for 67.6 percent of the common variance among the subtests. The individual indexes carried too little unique true-score variance to interpret with confidence, with Processing Speed the possible exception. They faulted the manual for making the primary indexes the principal level of interpretation, which ignores the general factor the FSIQ captures.

How the Scores Are Reported

A WISC-V report uses three kinds of number. Subtests are scaled scores with a mean of 10 and a standard deviation of 3, running from 1 to 19; Pearson treats 8 to 12 as average. Indexes and the FSIQ are standard scores with a mean of 100 and a standard deviation of 15; 90 to 109 is average. Each standard score comes with a percentile rank and a 95 percent confidence interval, the band in which the child's true score probably falls.

Pearson's own sample report explains a percentile plainly: a 92nd-percentile score means the child performed as well as or better than about 92 percent of children the same age. The WISC-V attaches these descriptive labels to standard scores:

The adult WAIS-IV calls 120 to 129 Superior and 130 and above Very Superior. Either way, the labels describe a position on the curve, nothing more. For how other tests word the same ranges, see the IQ classification chart.

What a 130, a 115 or a 100 Actually Says

An FSIQ of 100 sits at the 50th percentile: the exact middle of children that age. A 115 sits near the 84th percentile, one standard deviation up. A 130 sits near the 98th percentile and earns the label Extremely High; our page on an IQ of 130 covers how rare that is. The WISC-V's descriptive labels do not include the word gifted. Schools that run gifted programs set their own cutoffs and often combine the WISC-V with achievement data.

Three cautions apply to every number. First, the confidence interval: a reported 128 carries a band several points wide on each side, so the line between Very High and Extremely High is softer than the table suggests. Second, unevenness: gaps between indexes are common, and a gap alone is not a disorder. Third, conditions: fatigue, anxiety, illness or a poor night's sleep can pull a score down, and examiners note behavior for that reason.

For context on what counts as strong at each age, see average IQ by age and what a good IQ score is.

Retesting and Practice Effects

Scores rise when a child sees the same tasks twice. In Pearson's retest study, summarized by Canivez and Watkins, 218 children took the WISC-V a second time after 9 to 82 days, 26 days on average. The FSIQ held steady, correlating .91 between sessions. The primary indexes ranged from .68 for Fluid Reasoning to .91 for Verbal Comprehension. The gains were mostly small, and largest on the Processing Speed subtests, where speed improves once the format is familiar.

That is why examiners space administrations. Forensic psychologist Christopher Ray, reviewing the practice-effect literature in 2009, advised against giving most intelligence tests again within a year. Drilling a child on look-alike puzzles before testing has the same effect in miniature: it measures rehearsal, then compares the result with norms built on children who met the tasks cold.

Who Gives It and What It Costs

Pearson sells the WISC-V only at qualification level C, its highest tier, which in practice means licensed or certified psychologists: school psychologists, clinical psychologists and neuropsychologists. Schools may give it as part of a special-education or gifted evaluation. Private evaluation fees are set by the practitioner; Pearson publishes none.

Pearson does publish its materials prices. In October 2026 the complete print kit listed at $1,679, a pack of 25 record forms at $204.80 and a digital score report at $3. Those numbers explain why no legitimate version of the WISC-V exists online for free. Web quizzes borrow the name; none carries the norms. Our guide to whether online IQ tests are accurate explains the gap, and the free geniuses.club IQ test is a practice screener, not a substitute.

A sixth edition is on the way. Pearson Canada is recruiting families for a standardization study of the WISC 6 Canadian edition, for ages 6 to 16, and has published no release date.

How to Read Your Child's Report

1. Start with the FSIQ and its confidence interval, not the single number.
2. Read percentiles before labels. The 75th percentile means more to most parents than High Average.
3. Compare the GAI with the FSIQ. A large gap points to speed or memory as the drag.
4. Treat single subtests lightly. They are short and less reliable than the composites.
5. Ask what else was measured. Achievement tests, teacher reports and history give the scores meaning.

The WISC-V is one of the most carefully built instruments in psychology, and still a snapshot. More on testing and scores lives in our IQ guides, including the adult counterpart, the WAIS-IV, and the main rival for gifted assessment, the Stanford-Binet. A licensed psychologist interprets these scores.

Editorial standard: IQ figures for historical figures are retrospective estimates and are labeled as such; scores for living people appear only when the person disclosed them or a reputable outlet reported them. Corrections: contact the editors.