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Calcimator

Standardized Test Converter

Convert between percentile rank, stanine, NCE, z-score, and scale score for standardized tests.

Inputs

Results

Stanine

6

Z-Score0.38
Normal Curve Equivalent58
Scale Score (500 mean)538
Performance LevelProficient
How to Use This Calculator
  1. Enter the student's Percentile Rank (1–99) from their standardized test score report.
  2. The calculator instantly converts the percentile to a Stanine (1–9 scale) for quick grouping.
  3. Review the Z-Score to understand how many standard deviations above or below the mean the student scored.
  4. Use Normal Curve Equivalent (NCE) for comparing student progress over time in research-aligned contexts.
  5. The Scale Score (500 mean) approximates state test scale formats for planning discussions.
  6. Use Performance Level (Advanced, Proficient, Basic, Below Basic) for IEP, RTI, or parent communication purposes.

How the result changes with Percentile Rank

Percentile RankStanine
112
354
656
897

What each input means

Percentile Rank
Student's percentile rank (1-99) from a standardized test.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Percentile Rank = 65 = 1 input(s) provided
  2. Calculate Stanine
    6 = 6
  3. Calculate Z-Score
    Z-Score
    0.38 = 0.38
  4. Calculate Normal Curve Equivalent
    Normal Curve Equivalent = max(1
    58 = 58

Engine last updated .

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