WISC-V IQ Scores Explained: What Does Your Child's Score Mean?

The Wechsler Intelligence Scale for Children, Fifth Edition (WISC-V) is the most widely used individually administered IQ test for children ages 6–16. When a psychologist tests your child for giftedness, learning disabilities, or twice-exceptionality, it's most likely the WISC-V they're using. The score report contains multiple numbers — here's what each one means.

The Full Scale IQ (FSIQ)

The FSIQ is the single composite score that summarizes overall cognitive ability. It's derived from 10 of the test's core subtests, spanning five cognitive domains. The FSIQ is scaled to a mean of 100 and a standard deviation of 15. This means:

• FSIQ 100 = exactly average for the child's age
• FSIQ 115 = one standard deviation above average (84th percentile)
• FSIQ 130 = two standard deviations above average (98th percentile)
• FSIQ 145 = three standard deviations above average (99.9th percentile)

WISC-V Score Classification Table

The Five Composite Indexes

Beyond the FSIQ, the WISC-V produces five Primary Index Scores — each measuring a distinct cognitive domain. These are also IQ-scale scores (mean 100, SD 15):

• Verbal Comprehension Index (VCI): Measures verbal reasoning, vocabulary, and the ability to understand and express ideas in words.
• Visual Spatial Index (VSI): Measures the ability to analyze and synthesize visual-spatial information — understanding shapes, space, and visual relationships.
• Fluid Reasoning Index (FRI): Measures inductive and deductive reasoning using nonverbal and verbal stimuli. This is often considered the "pure intelligence" measure.
• Working Memory Index (WMI): Measures the ability to hold and manipulate information in short-term memory — crucial for math, reading comprehension, and following directions.
• Processing Speed Index (PSI): Measures the speed and accuracy of processing simple visual information. Slow processing speed can mask otherwise high ability.

What Score Qualifies as Gifted?

Most gifted programs using the WISC-V set the cutoff at FSIQ 130 (98th percentile) — the traditional two-standard-deviations-above-average threshold. Some programs use FSIQ 125 or 120.

Importantly, some psychologists and programs also consider high index scores even when the FSIQ is lower. A child with a VCI of 140 and a PSI of 100 may have an FSIQ of 122 — but their verbal reasoning ability is in the profoundly gifted range. This is why profile interpretation matters, not just the composite score.

Twice-Exceptional Children

Some children have both gifted-level ability and a learning disability or ADHD. These "twice-exceptional" (2e) children may have uneven profiles — a very high VCI with a low WMI, for example. In these cases, the FSIQ may significantly underestimate the child's intellectual ceiling. Gifted programs increasingly look at individual index scores rather than requiring a uniformly high FSIQ.

Can Scores Change?

WISC-V scores are relatively stable but not fixed. Children who are retested (typically after 2+ years) may score differently due to practice effects, development, medication changes, or environmental factors. IQ scores tend to stabilize more as children approach adolescence. A score from age 6 is less predictive of later ability than a score from age 10.