Enter the Step 1 score, mean Step 1 score, and standard deviation of Step 1 scores into the calculator to determine the percentile rank.

## Step 1 Percentile Formula

The following formula is used to calculate the Step 1 Percentile.

P = (S - M) / SD

Variables:

- P is the percentile rank S is the Step 1 score M is the mean Step 1 score SD is the standard deviation of Step 1 scores

To calculate the Step 1 Percentile, subtract the mean Step 1 score from the individual’s Step 1 score. Then, divide the result by the standard deviation of Step 1 scores. The result is the percentile rank of the individual’s Step 1 score.

## What is a Step 1 Percentile?

A Step 1 Percentile is a scoring system used in the United States Medical Licensing Examination (USMLE) Step 1. It ranks a student’s performance in comparison to their peers. For example, if a student is in the 90th percentile, it means they scored higher than 90% of test takers. This percentile is used by residency programs to compare applicants and determine their knowledge in basic science material.

## How to Calculate Step 1 Percentile?

The following steps outline how to calculate the Step 1 Percentile using the formula: P = (S – M) / SD

- First, determine the Step 1 score (S).
- Next, determine the mean Step 1 score (M).
- Next, determine the standard deviation of Step 1 scores (SD).
- Use the formula P = (S – M) / SD to calculate the Step 1 Percentile.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

Step 1 score (S) = 230

Mean Step 1 score (M) = 220

Standard deviation of Step 1 scores (SD) = 10