NBME 15 to Step 2 CK conversion

Q: How do I convert my NBME 15 percent correct to a score?

Enter your raw percent correct on NBME 15 above and the tool converts it to the 3-digit NBME 15 score, then to a predicted Step 2 CK score. It is calibrated on real reports that listed both a percent and a score, and cross-checked against published conversions.

Based on 436 real score reports that included an NBME 15 result. The actual Step 2 score was about 6 points higher than the NBME 15 score, on average. Used alone, an NBME 15 score predicts the real result with a typical error of about ±6.0 points. Combining multiple tests usually reduces the error.

Your NBME 15 score→—

Not sure what your 3-digit NBME 15 score is? Convert from % correct →

Each dot is one real report: their NBME 15 result against the Step 2 CK score they went on to get. Hover or tap a dot to see that person's full test list. r = 0.70, n = 434.

The calculator assumes the test was taken about 7 days before the exam, the typical timing in the underlying reports. Taking it closer to test day shifts the prediction; the main predictor uses your exact timing and every other test you have taken.

Common questions

Does NBME 15 underpredict your Step 2 score?

In the collected score reports, NBME 15 underpredicted the actual score by about 6 points on average. The conversion accounts for that average difference.

How accurate is NBME 15 alone at predicting Step 2?

A single NBME 15 score predicts the real result with a typical error of about ±6.0 points. The main predictor combines several tests, which usually reduces the error.

How do I convert my NBME 15 percent correct to a score?

Enter your raw percent correct above. NBME 15 has 200 questions, so each one is worth about half a percent; the converter maps your percent to the 3-digit NBME 15 score (about 2.2 points per percent, calibrated on real reports and cross-checked against published conversions) and then to a predicted Step 2 CK score.

Convert NBME 15 % correct to a 3-digit score

Took NBME 15 offline and only have a raw percent correct? Estimate your 3-digit form score below — it also fills into the calculator at the top of the page, so you still get a Step 2 prediction.

Your NBME 15 % correct→—

NBME 15 is newer, so this blends our limited reports with published conversion data — treat it as approximate (about ±5 points). Convert a different form →

Combine your scores

Combine your practice scores and test dates in the full predictor. Open the predictor →

Charts & guides

Browse the score analyses, study-data pages, and assessment converters.

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