NBME Self-Assessments: Forms, Scores, and Next Steps
Choose the correct assessment family for Step 1, Step 2 CK, or Step 3; read the official score report first; then use an independent calculator when you need a combined estimate.
TL;DR — 90-second summary
- NBME forms = official practice exams for Step 1 and Step 2 CK, written by the same people who write the real test.
- Match the family to the exam: CBSSA for Step 1, CCSSA for Step 2 CK, and CCMSA for Step 3.
- Treat the official score report as the source of truth. An independent estimate should show uncertainty, not promise a fixed point adjustment.
- Use a calculator like this one to adjust for recency, multiple inputs, and confidence interval.
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Enter your NBME scores below to get an adjusted Step prediction with a 95% confidence interval.
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Which NBME assessment family should I use?
Start with the exam you are preparing for. Form numbers are not interchangeable across assessment families.
| Form | When to take | Notes |
|---|---|---|
| CBSSA | Preparing for Step 1 | Comprehensive Basic Science Self-Assessment. Use its official readiness and performance feedback for the pass/fail Step 1 exam. |
| CCSSA | Preparing for Step 2 CK | Comprehensive Clinical Science Self-Assessment. This is the comprehensive NBME family aligned with Step 2 CK. |
| CCMSA | Preparing for Step 3 | Comprehensive Clinical Medicine Self-Assessment. Use this family when estimating Step 3 readiness. |
| Clinical Science Mastery Series | Checking a clerkship subject | Subject-focused CMS forms can reveal weak clinical areas, but they are not a direct substitute for a comprehensive CCSSA. |
What does my NBME score actually mean?
Translate your three-digit NBME equivalent into an action plan. Reminder: reporting differs by assessment family, and an independent estimate does not replace the official score report.
Why a calculator, when NBME already gives me a number?
Three reasons.
Source-aware modelling
The calculator treats comprehensive, subject-level, and third-party inputs differently instead of applying one fixed adjustment to every score.
Multi-source aggregation
One NBME ≠ your real ability. We combine NBME, UWSA, Free 120, and AMBOSS into a single weighted estimate.
Confidence interval
A point estimate without an interval is misleading. We give you the 95% CI so you know how wide the realistic range is.
Frequently asked questions
What is the NBME?+
The National Board of Medical Examiners develops assessments used across medical education and offers self-assessments aligned with Step 1, Step 2 CK, and Step 3 preparation.
Are NBME self-assessments worth the money?+
They can provide useful readiness and content-area feedback because they are aligned with the target exam. Whether another form is worth purchasing depends on your timeline, prior results, and what decision the result would change.
What three-digit score does the NBME report?+
Reporting differs by assessment family and can change over time. Use the official score report as the source of truth; this site provides an independent estimate and confidence interval, not an official conversion.
Which NBME should I take first?+
First choose the correct family: CBSSA for Step 1, CCSSA for Step 2 CK, or CCMSA for Step 3. Within that family, use an earlier form for a baseline and preserve another unused form for a later readiness check.
Can I retake the same NBME form?+
Technically yes, but the score loses validity. You'll remember roughly 30% of questions, which artificially inflates your score by 10-15 points. Use each form once.
What is a passing score on NBME?+
An NBME self-assessment does not have a universal pass score across every product. For the real Step 2 CK exam, the passing standard is 218 as of July 1, 2025. For Step 1, use the probability and readiness guidance in the official CBSSA score report.
Ready to convert your NBME?
Use the free calculator above, or dive deeper into the conversion tables.