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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.
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