# Step 3 Percentile Calculator

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The Step 3 Percentile Calculator helps you determine your percentile rank based on your USMLE Step 3 score. The calculation uses the normal distribution, considering the mean score and standard deviation typically published by testing authorities.

### Calculation Explanation

The calculator uses the formula for the Z-score, followed by applying the error function (erf) to convert it into a percentile:

\[ Z = \frac{\text{Your Score} - \text{Mean Score}}{\text{Standard Deviation}} \]

This Z-score is then converted to a percentile using the error function.

### Usage Scenarios

This tool is particularly useful for medical students and professionals looking to gauge how their Step 3 score compares to that of other test-takers.