NBME 9 Score CalculatorStep 2 CK Score Conversion · Week 1–2 Baseline Diagnostic
200 questions · Week 1–2 of dedicated study. Enter wrong answers to get your predicted 3-digit NBME 9 Step 2 CK score and score conversion instantly. NBME 9 is the oldest active Step 2 CK form — and the most important one to interpret correctly. It is not a readiness predictor; it is a gap-identification tool. Expect your predicted score to run approximately 10 points below what you will score on later forms.
NBME 9 Underpredicts by Approximately 10 Points — Do Not Use This Score for Scheduling
Community data (yousmle.com, thematchguy.com, medboardtutors.com) and this project's score notes consistently indicate that NBME 9 predicted scores run approximately 10 points below what students score on later forms and on the real Step 2 CK exam. A predicted score of 208 on NBME 9 corresponds to roughly 218 on the real exam. The current Step 2 CK passing threshold is 218 (effective July 1, 2025). Do not use NBME 9 as a scheduling signal under any circumstances. Use NBME 13 (Week 6) or UWSA 2 (final 7–10 days) for scheduling decisions. No peer-reviewed predictive accuracy study exists for any Step 2 CK practice assessment (unlike Step 1's Seal et al. 2020, Cureus, PMC7198101).
How to Use NBME 9 for Step 2 CK Preparation
NBME 9 serves one function in Step 2 CK preparation: exposing gaps in your clinical knowledge base before you begin systematic review. Take it at the very start of dedicated study — Week 1 if possible, Week 2 at the latest. When you receive your results, go directly to the performance report and analyze your score by organ system and physician task. The 3-digit score itself carries no scheduling information; the category breakdown tells you where to direct your study effort in the weeks ahead.
NBME 9 was written when the Step 2 CK blueprint emphasized rote diagnostic recall over clinical management reasoning. It contains diagnostic criteria and treatment protocols that have since been updated or abandoned, and over-indexes on rare pediatric conditions and obstetric scenarios that no longer appear with comparable frequency on the real exam. The current exam emphasizes Next Best Step in Management, Quality Improvement, and Patient Safety — areas where NBME 9 provides minimal exposure. Students commonly score 15–20 points lower on NBME 9 than on NBME 10 taken just 1–2 weeks later, not because their preparation improved dramatically, but because NBME 10's content is representative of the modern exam and NBME 9's is not.
Despite its outdated content, NBME 9 has real diagnostic value: it reliably exposes breadth gaps. If you miss a high proportion of questions in Cardiology or Gastroenterology on NBME 9, that gap is likely real — even if the specific question wording is outdated, the underlying clinical reasoning deficiency transfers to the real exam. Treat NBME 9 as a stress test for your knowledge breadth, then completely discard the 3-digit predicted score.
~10-point underprediction estimate reflects scoreData project notes ("expect to score 10–15 pts lower than later forms") and community consensus from yousmle.com, thematchguy.com, and medboardtutors.com. No NBME 9–specific peer-reviewed predictive accuracy study exists.
NBME 9 Score Benchmarks — Step 2 CK
All predicted scores below are from the NBME 9 formula. Add ~10 pts for an estimated real exam range. Do not compare NBME 9 predicted scores to specialty thresholds without this adjustment.
| Wrong | Predicted | Est. Real Exam (~+10) | Signal |
|---|---|---|---|
| 15 | ~282 | ~292 | Exceptional — competitive specialty territory |
| 25 | ~271 | ~281 | Strong — well above competitive cutoff |
| 35 | ~260 | ~270 | Good — above 240 competitive threshold |
| 50 | ~244 | ~254 | Solid — within competitive specialty range |
| 60 | ~233 | ~243 | Above safe zone (230+) est. |
| 70 | ~222 | ~232 | Near safe zone est. |
| 73 | ~219 | ~229 | Above passing threshold — borderline |
| 74 | ~218 | ~228 | At passing threshold — borderline |
| 75+ | <218 | <228 est. | Below passing predicted — adjust by +10 before deciding |
Formula: 298.45 − 1.09 × wrong answers. Passing threshold: 218 (USMLE.org, effective July 1, 2025).
NBME 9 underpredicts by ~10 pts — add ~10 to each predicted score for a rough real exam estimate. 240+ competitive threshold corresponds to 53 or fewer wrong answers (wrong=53 → ~241; wrong=54 → ~240, borderline). Specialty thresholds (230+/240+) reflect community consensus — not official NRMP data. Do not use NBME 9 predicted scores for scheduling decisions.
NBME 9 vs Adjacent Forms — Step 2 CK Early Dedicated Progression
| NBME 9 | NBME 10 | NBME 11 | NBME 12 | |
|---|---|---|---|---|
| Slope (pts/wrong) | 1.09 | 1.10 | 1.08 | 1.09 |
| Intercept | 298.45 | 300.18 | 299.50 | 300.18 |
| Questions | 200 | 200 | 200 | 200 |
| Difficulty | Hard | Moderate | Moderate | Moderate |
| Recommended timing | Week 1–2 | Week 3–4 | Week 4–5 | Week 5–6 |
| Prediction bias | ~10 pts under | Leans to underpredict | ~3–5 pts over (limited) | Direction unclear |
| Content style | Outdated trivia | Clinical reasoning | Clinical + first QI | Clinical reasoning |
| Primary use | Baseline diagnostic | Week 3–4 benchmark | Mid-dedicated + QI | Late mid benchmark |
| Data source | Community | Community | Community (limited) | Community (limited) |
NBME 9 underprediction (~10 pts) reflects community consensus from yousmle.com, thematchguy.com, medboardtutors.com, and scoreData project notes.
At 60 wrong answers: NBME 9 → ~233, NBME 10 → ~234, NBME 11 → ~235, NBME 12 → ~235. (NBME 9: 298.45−1.09×60=233.05→~233; NBME 10: 300.18−1.10×60=234.18→~234) NBME 9 predicted scores do not indicate scheduling readiness — add ~10 pts for real exam estimate.
NBME 9 Score Conversion Table — Step 2 CK
| Wrong | Correct | % Correct | Predicted Score | Pass Prob |
|---|---|---|---|---|
| 0 | 200 | 100% | 298 | 99.9% |
| 5 | 195 | 97.5% | 293 | 99.9% |
| 10 | 190 | 95% | 288 | 99.9% |
| 15 | 185 | 92.5% | 282 | 99.9% |
| 20 | 180 | 90% | 277 | 99.9% |
| 25 | 175 | 87.5% | 271 | 99.9% |
| 30 | 170 | 85% | 266 | 99.9% |
| 35 | 165 | 82.5% | 260 | 99.9% |
| 40 | 160 | 80% | 255 | 99.9% |
| 45 | 155 | 77.5% | 249 | 99.6% |
| 50 | 150 | 75% | 244 | 99.1% |
| 55 | 145 | 72.5% | 239 | 97.8% |
| 60 | 140 | 70% | 233 | 93.7% |
| 65 | 135 | 67.5% | 228 | 85.8% |
| 70 | 130 | 65% | 222 | 67.3% |
| 75 | 125 | 62.5% | 217 | 45.5% |
| 80 | 120 | 60% | 211 | 22.1% |
| 85 | 115 | 57.5% | 206 | 10.3% |
| 90 | 110 | 55% | 200 | 3.8% |
| 95 | 105 | 52.5% | 195 | 1.6% |
| 100 | 100 | 50% | 189 | 0.5% |
| 105 | 95 | 47.5% | 184 | 0.2% |
| 110 | 90 | 45% | 179 | 0.1% |
| 115 | 85 | 42.5% | 173 | 0.1% |
| 120 | 80 | 40% | 168 | 0.1% |
| 125 | 75 | 37.5% | 162 | 0.1% |
| 130 | 70 | 35% | 157 | 0.1% |
| 135 | 65 | 32.5% | 151 | 0.1% |
| 140 | 60 | 30% | 146 | 0.1% |
| 145 | 55 | 27.5% | 140 | 0.1% |
| 150 | 50 | 25% | 140 | 0.1% |
| 155 | 45 | 22.5% | 140 | 0.1% |
| 160 | 40 | 20% | 140 | 0.1% |
| 165 | 35 | 17.5% | 140 | 0.1% |
| 170 | 30 | 15% | 140 | 0.1% |
| 175 | 25 | 12.5% | 140 | 0.1% |
| 180 | 20 | 10% | 140 | 0.1% |
| 185 | 15 | 7.5% | 140 | 0.1% |
| 190 | 10 | 5% | 140 | 0.1% |
| 195 | 5 | 2.5% | 140 | 0.1% |
| 200 | 0 | 0% | 140 | 0.1% |
About NBME 9
Baseline assessment — notoriously harsh and outdated.
Known for unusual trivia and outdated content. Expect to score 10–15 pts lower than later forms. Use purely for gap identification, not confidence.
Other Step 2 CK Practice Exams
NBME 9 Step 2 CK Calculator — FAQ
This tool is for educational purposes only. Not affiliated with NBME® or USMLE®. NBME 9 predicted scores systematically underpredict actual Step 2 CK scores by approximately 10 points — do not use NBME 9 for scheduling decisions. Predictions carry an estimated error of ±5–10 points beyond the underprediction bias. Specialty score thresholds (230+/240+) are less meaningful for NBME 9 — adjust by +10 pts before comparison. Passing threshold (218) per USMLE.org, effective July 1, 2025.