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How is the WIAT Test Scored?

WIAT test scoring (Wechsler Individual Achievement Test-Third Edition) is based on several derivations of status scores and growth scores.  They are as follows:

Status Scores

  • Standard Score
  • Percentile Rank
  • Normal Curve Equivalent
  • Stanines

Growth Scores

  • Grade Equivalent
  • Age Equivalent
  • Growth Scale Values

For standard scores, each number given shows the level at which your child is performing.

Score                Classification

130-above         Very Superior

120-129             Superior

110-119             High Average

90-109               Average

80-89                 Low

70-79                 Borderline

69-below           Extremely Low

The administrators then use these scores to interpret performance by noting and comparing the following, noting the pattern of strengths and weaknesses:

  • Growth Scale Values
  • Grade-Based and Age-Based Scores
  • Composite Scores
  • Score Differences
  • Statistical Significance of Score Differences
    • Frequency of Score Differences
    • Qualitative Evaluation of Subtest Component Score Differences
      • Out-of-Level Item Set Performance

*Note: The WIAT is an achievement test that measures how an individual is doing in areas of academic work. It will give a summary of achievement and understanding in subjects like reading, math, written language, and oral language. has over 2,500 sample practice questions to help your child become familiar with and practice the types of questions administered on the WIAT-III.

To get started with all of the WIAT testing material offered by Testing Mom, check out our 100 Free Questions.

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4 Responses


Wechsler Individual Achievement Test- Third Edition (WIAT-III)
where is the IQ in composite scores

Total Reading SScore 81 10%
Basic Reading SScore 83 13%
Comprehension SScore 81 10%
Written Expression SScore 81 10%
Mathematics SScore 92 30%

Hi Katia,

For score interpretation on the WIAT I would recommend reaching out to the psychologist that administered the test.

All the best,



The qualitative ranges given in this article are incorrect.

Hi Kristin –

Thank you for your comment.

Would you please email us at with the information that is incorrect?

All the best,


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