SCALED 1–19 · INDEX 40–160

WAIS / WISC converter: reading a Wechsler report.

Wechsler reports use two scales: subtest scores out of 19 and index scores around 100. Tap a scaled score to see its equivalents, then build a whole profile below.

SCALED SCORE13mean 10, SD 3
INDEX EQUIVALENT115100 + 5 × (scaled − 10)
PERCENTILE84thof the same-age norm group
z-SCORE+1.00(scaled − 10) / 3
PROFILE BUILDER

Subtests in, index scores out

Verbal Comprehension118
Perceptual Reasoning106
Working Memory97
Processing Speed92
ESTIMATED FSIQ10666th percentile · Average
GAI113reasoning without WM / speed
INDEX SPREAD: 26 POINTSMore than about 1.5 SD between highest and lowest index. Many clinicians then treat the FSIQ as a weaker summary and interpret the indexes (or GAI) instead.
SIVCINBDMRVPDSARSSCD

Bars rise or fall from the mean scaled score of 10. Indexes and FSIQ here are estimates from a composite formula (assumed subtest correlations about .6 within an index, .45 across), not the publisher's sum-of-scaled-scores tables. Only a qualified examiner's report gives your actual scores.

SAME NUMBER, DIFFERENT WORDS

How each edition describes an index score

SCOREWAIS-IV (2008)WISC-V (2014) · WAIS-5 (2024)
130+Very superiorExtremely high120–129SuperiorVery high110–119High averageHigh average90–109AverageAverage80–89Low averageLow average70–79BorderlineVery low≤69Extremely lowExtremely low

Newer editions replaced value-laden words such as "Borderline" and "Superior" with descriptive ones. Your FSIQ row is highlighted.

WHICH WECHSLER?

Four indexes became five

REFERENCES
  1. Wechsler, D. (2008). WAIS-IV Technical and Interpretive Manual. Pearson.
  2. Wechsler, D. (2014). WISC-V Technical and Interpretive Manual. Pearson.
  3. Tellegen, A., & Briggs, P. F. (1967). Old wine in new skins: Grouping Wechsler subtests into new scales. Journal of Consulting Psychology, 31(5), 499–506.
  4. Weiss, L. G., Saklofske, D. H., Holdnack, J. A., & Prifitera, A. (2016). WISC-V Assessment and Interpretation. Academic Press.

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