Equated percent correct
Your difficulty-adjusted mastery estimate on the current CBSSA scale.
Step 1 · CBSSA Form 30
NBME 30 Score Conversion and Report Reader
Use the ranges already printed on your official CBSSA report. This page interprets Form 30 without presenting a community raw-score formula as an official conversion.
Copy the two ranges from your official CBSSA report. This reader does not invent a raw-wrong-answer conversion or replace the probability printed by NBME.
%
Check that each lower value is not greater than its upper value and that all entries are within the displayed percentage range.
The short answer on NBME 30 conversion
Current CBSSA reports do not require a third-party wrong-answer conversion. NBME reports an equated percent correctscore that is already adjusted for small form-difficulty differences.
The report also shows a likely score range, the Step 1 low-pass range, and an estimated probability of passing if you test within one week. Those official fields are more useful than an unofficial three-digit reconstruction.
Do not mix score scales
A current EPC percentage, a legacy three-digit self-assessment score, and a count of wrong answers are different inputs. A calculator that silently treats them as interchangeable can produce a confident-looking but meaningless result.
Read the four report signals together
Likely score range
How much the CBSSA result could vary if repeated without a real change in knowledge.
Step 1 low-pass range
The report's reference band for performance near the minimum passing standard.
Estimated probability
NBME's time-sensitive estimate for testing within one week—not a guarantee.
Official references: NBME CBSSA score-report update and NBME readiness guidance.
Use Form 30 as one checkpoint
Compare results only within the correct assessment family and keep testing conditions visible. A self-paced or repeated form is not equivalent to a fresh form taken under exam-like conditions.
NBME 30 FAQs
Can I convert NBME 30 wrong answers into an official Step 1 score?
No universal public formula reproduces NBME's equating. The current CBSSA report already adjusts for form difficulty and reports an equated percent correct score, likely score range, low-pass range, and estimated probability of passing.
Does NBME 30 still give a three-digit Step 1 score?
Current CBSSA score reports use equated percent correct and an estimated probability of passing rather than the former three-digit Step 1 self-assessment score. Older screenshots and offline conversion discussions may use a different scale.
What matters most on an NBME 30 report?
Read the official estimated probability together with your likely CBSSA score range and its position relative to the Step 1 low-pass range. Consider testing conditions and your trajectory across more than one assessment.
Is an NBME 30 result enough to decide my exam date?
No single result is a guarantee. NBME advises considering all report information together, and borderline or discordant results should be discussed with your school or an academic advisor.