NBME Score Conversion: Percent Correct to Step 2 CK Score
Enter one NBME form's percent correct (CCSSA Forms 9–16) and get an estimated Step 2 CK score, likely range, and 2026 percentile. For example, 75% correct is about 244. Combining several practice tests? Use the Step 2 CK score predictor.
Your own percent correct. It can differ slightly from EPC, so the range is wider.
Estimated Step 2 CK score · NBME 16
244
Likely range 228–260
75% correct on NBME 16 estimates about 244 on the Step 2 CK scale.
- Passing standard (218)
- Whole range is above passing
- 2026 national percentile of 244
- 30th percentile
- Input used
- Self-counted percent · 75%
Independent NBMEcalc estimate built from two reference points in NBME's published sample CCSSA report. It is not an official NBME conversion. If your score report already shows a Total CCSSA Score, that number is NBME's own Step 2 CK estimate — use it directly.
NBME score conversion: quick answer by exam
NBME does not publish one conversion table for every exam. How you convert depends on which self-assessment you took:
Step 2 CK (CCSSA Forms 9–16)
Each 1% of equated percent correct is worth about 2.5 points in this model: 65% ≈ 219 (passing is 218), 75% ≈ 244, 80% ≈ 257. A Total CCSSA Score on your report is already NBME's own Step 2 CK estimate.
Step 1 (CBSSA Forms 28–34)
Step 1 is pass/fail, so there is no three-digit score to convert to. Read the estimated probability of passing and the low-pass range on your report, or use the Step 1 readiness check.
Step 3 (CCMSA)
The current CCMSA reports a 10–800 assessment score, not a Step 3 score, and NBME does not publish a conversion. The Step 3 score predictor explains how to read NBME 6 and 7 results.
Took the Free 120 instead? Use the Free 120 score conversion.
NBME score conversion chart: percent correct to Step 2 CK
Estimated Step 2 CK scores for CCSSA equated percent correct (EPC). The same chart applies to Forms 9–16 because EPC is already adjusted for form difficulty. If you counted your own percent correct, expect the true value to sit a little higher or lower than the row shown.
| Percent correct | Estimated Step 2 CK score | Likely range | 2026 percentile |
|---|---|---|---|
| 50% | 181 | 165–197 | <1st |
| 52% | 186 | 171–201 | <1st |
| 54% | 191 | 177–205 | <1st |
| 56% | 196 | 183–209 | <1st |
| 58% | 201 | 189–213 | <1st |
| 60% | 206 | 194–218 | <1st |
| 62% | 211 | 199–223 | 1st |
| 64% | 216 | 204–228 | 2nd |
| 66% | 221 | 209–233 | 4th |
| 68% | 226 | 214–238 | 7th |
| 70% | 231 | 219–243 | 10th |
| 72% | 236 | 224–248 | 17th |
| 74% | 241 | 229–253 | 25th |
| 76% | 246 | 234–258 | 34th |
| 78% | 252 | 239–265 | 50th |
| 80% | 257 | 243–271 | 63rd |
| 82% | 262 | 247–277 | 76th |
| 84% | 267 | 251–283 | 87th |
| 86% | 272 | 255–289 | 95th |
| 88% | 277 | 259–295 | 99th |
| 90% | 282 | 263–300 | >99th |
Percentiles come from the official 2026 USMLE Step 2 CK percentile table. The passing score is 218.
NBME score conversion by form (CCSSA 9–16)
NBME reports an equated percent correct, so the same percentage means the same estimated Step 2 CK score on every form: about 231 at 70%, 244 at 75%, and 257 at 80%. Pick your form below to open the converter with it preselected.
NBME 9 score conversion
One of the three CCSSA forms NBME released in July 2021, when self-assessments grew from 184 to 200 questions and Forms 6–8 were retired.
NBME announcementNBME 10 score conversion
Released with Forms 9 and 11 in July 2021 as part of the first 200-question CCSSA set.
NBME announcementNBME 11 score conversion
The third form of the July 2021 release. Because scores are equated, an 11 result can be compared directly with later forms.
NBME announcementNBME 12 score conversion
NBME has not published a separate release note for Form 12, so it is treated like any other equated CCSSA form here.
NBME 13 score conversion
No form-specific NBME note is published. Use the report's EPC when you have it; a self-counted percent adds uncertainty.
NBME 14 score conversion
No form-specific NBME note is published. If you took Form 14 alongside another CCSSA, compare the two EPC values rather than raw counts.
NBME 15 score conversion
One of the two newest forms. Its own page covers the Form 15 conversion chart and how it pairs with Form 16.
NBME 16 score conversion
The newest CCSSA form, often saved for the final week. NBME announced its updated, USMLE-style interface would reach the comprehensive self-assessments by the end of March 2026.
NBME interface updatePreparing for Step 1 instead? CBSSA Forms 28–34 use a different report. Use the NBME Step 1 score conversion and readiness check. Have more than one practice test? The Step 2 CK score predictor combines several NBME, UWSA, and Free 120 results into one estimate.
How this NBME conversion is calculated
NBME does not publish a percent-to-score table. Its official sample CCSSA score report does, however, print both scales side by side, which gives two reference points:
- The Step 2 CK comparison group averages about 77% EPC across disciplines (weighted by NBME's published question share), and the report lists that group's mean Step 2 CK score as 249.
- The sample examinee scores about 58% EPC with the same weighting and a Total CCSSA Score of 201.
Connecting those points gives roughly 2.5 Step 2 CK points per percentage point. The likely range starts from the report's own ±8-point precision, adds a model allowance, and widens further outside the 58%–77% band and for self-counted percentages.
This is an independent estimate, not an official NBME conversion, and it has not been externally validated. When your report shows a Total CCSSA Score, that is NBME's own Step 2 CK estimate — enter it unchanged in the multi-exam calculator below.
Combine several practice exams
Have a Total CCSSA Score?
Choose Step 2 CK and enter the three-digit score and form number from your NBME report. Supported forms are 9–16.
Checking Step 1 readiness?
Current CBSSA reports use EPC and provide an official pass probability. Read those fields directly; do not enter EPC in the calculator's Step 2 CCSSA field.
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NBME 32 score conversion: what to enter
For a current NBME 32 score conversion, start with the equated percent correct, likely range, and estimated probability of passing printed on the CBSSA report. There is no supported reason to force that EPC onto the Step 2 CCSSA scale.
NBMEcalc therefore does not accept current Form 32 EPC as a direct NBME calculator input. For a test-date decision, use the official report's estimated probability of passing and low-pass range, then compare it qualitatively with other recent evidence.
Find the right NBME form family
NBME form numbers are not interchangeable across Step exams. This hub remains the primary page for the family. Dedicated pages are admitted only when the user task is distinct and the page adds a real preset tool or report workflow.
Step 2 CK CCSSA forms 9-16
Use this family for Step 2 CK score conversion and readiness checks.
- NBME 10 Step 2 score conversion
- NBME 11 score conversion
- NBME 14 score conversion
- NBME 15 Step 2 CK score conversion
- NBME 16 score conversion
Most Form queries remain consolidated here. Forms 15 and 16 have dedicated pages because Search Console and the live SERP both show a distinct calculator-shaped task.
Open Step 2 predictorStep 1 CBSSA forms 28-34
Use this family for Step 1 pass-readiness planning.
- NBME Step 1 score conversion
- NBME 34 score conversion
- NBME 28 score conversion
- NBME 31 score conversion
- NBME 30 score conversion
- NBME 32 score calculator
Step 1 is pass/fail. The Form 30 pilot reads the official CBSSA ranges instead of fabricating a raw-wrong-answer formula; Form 32 stays consolidated here to protect its existing ranking.
Open Step 1 readiness checkStep 3 CCMSA forms 5-7
Use this family for Step 3 planning, especially when paired with CCS practice.
- NBME 6 Step 3 score conversion
- NBME 7 Step 3 score conversion
- Step 3 NBME score conversion
- NBME Step 3 score conversion
Step 3 search demand is served on one evidence page. It explains the current 10-800 CCMSA scale and why NBMEcalc does not publish an unsupported Form 6/7 conversion table.
Open Step 3 predictorAlready have a Total CCSSA Score?
A current CCSSA Total Score already estimates Step 2 CK performance. Enter that 1-300 score unchanged; converting 240 into a different midpoint would double-transform the report's estimate. The percent-correct converter above is for when you only have a percentage.
If your goal is to test one weak clinical area rather than overall readiness, use the guide to choose a CMS subject form.
Check the current official CCSSA sample report| Official report field | What it means | What NBMEcalc does |
|---|---|---|
| Total CCSSA Score | A 1-300 estimate of Step 2 CK performance under comparable knowledge and testing conditions. | Enter it unchanged. NBMEcalc keeps it as the assessment midpoint. |
| Score range | The report's uncertainty around the Total CCSSA Score. | Read it alongside, not as a replacement for, NBMEcalc's model-generated range. |
| Content-area feedback | Relative strengths and weaknesses within the assessed content. | Use it for study planning; it is not another overall score input. |
Source: current NBME CCSSA sample score report. NBMEcalc's combined multi-source output remains an independent, unvalidated planning estimate and does not replace the official report.
NBME to Step 1 (Pass / Fail) Conversion
Step 1 is pass/fail. The official CBSSA report already contains readiness information, so start with those fields rather than an unofficial numeric conversion chart.
| Official report field | How to use it |
|---|---|
| Equated percent correct | Compare performance across recent CBSSAs using the report's own scale. |
| Estimated probability of passing | Use the probability printed by the official score report as the primary readiness signal. |
| Low-pass range | Treat overlap with this range as uncertainty that deserves another official checkpoint or advisor discussion. |
UWSA, Free 120, and other source adjustments
UWSA inputs receive source-specific model treatment. No fixed subtraction is an official conversion.
Free 120 is a useful late-stage readiness signal. Use it alongside a recent NBME rather than treating any one input as definitive.
Enter the 3-digit estimate shown on the Step 2 Self-Assessment report. The model preserves that value and uses a lower, unvalidated source weight when combining assessments.
Model handling is built into our calculator. Enter the value from the corresponding report scale.
Related conversion calculators
A single NBME is useful, but the forecast improves when recent inputs agree. These related pages cover the other conversion searches that showed up in Search Console.
How the calculator treats supported scores
A current Step 2 CCSSA Total Score is retained as the assessment midpoint. Other supported sources use source-specific mappings and recency weighting. Those additional mappings are independent model assumptions, not official NBME or USMLE conversion rules.
A reproducible outcome dataset and holdout validation report are not currently published. For that reason, we do not claim a verified cohort size, median error, or form-specific accuracy ranking. The public methodology page records the current assumptions and material changes.
What this is not: a guarantee. Test-day performance, content domain shifts, and the NBME's own psychometric adjustments mean any single prediction has natural variance. Treat the displayed range as planning context—not ground truth—and compare it with official guidance.
- Official facts linked to primary sources
- Assessment families kept separate
- Uncertainty shown with every estimate
- Public methodology and change log
Frequently asked questions
How do I convert my NBME percent correct to a Step 2 CK score?+
Choose your CCSSA form, enter your percent correct (or the number of questions correct out of 200), and the converter returns an estimated three-digit Step 2 CK score with a likely range. As a rule of thumb from the model, 65% correct is about 219, 75% is about 244, and 85% is about 269.
What percent correct do I need to pass Step 2 CK on an NBME?+
The Step 2 CK passing score is 218. In this model that corresponds to roughly 65% correct (EPC). Because every estimate has a range, a result in the mid-60s should be treated as borderline rather than a safe pass.
How accurate is NBME score conversion?+
NBME does not publish a percent-to-score table, and NBMEcalc does not yet publish a verified error rate. The converter connects two reference points from NBME's official sample CCSSA report, so treat it as an independent planning estimate, use the full displayed range, and rely on the Total CCSSA Score on your official report when you have it.
Which NBME forms are most predictive of my Step 2 CK score?+
Use a recent Comprehensive Clinical Science Self-Assessment (CCSSA) and read its official score report first. This independent converter is most useful when you combine more than one recent CCSSA result with UWSA or Free 120 rather than relying on a single form.
Is the NBME score the same as a USMLE Step score?+
No. A practice-assessment score and a final USMLE result come from different administrations. This converter applies published internal assumptions; it is not an official one-to-one mapping.
How do I convert UWSA scores to a Step score?+
The calculator treats UWSA 1 and UWSA 2 separately, using current internal adjustments of −5 and −2 before aggregation. These are model assumptions, not official universal offsets.
Does NBME conversion work for the new pass/fail Step 1?+
For Step 1, use the official CBSSA report's estimated probability of passing and low-pass range first. NBMEcalc also shows an experimental model estimate, but it is not a replacement for the official report.
Can I trust online NBME conversion charts?+
Be careful with any chart that does not state its assessment family, date, scale, sample, exclusions, and validation method. NBMEcalc publishes its assumptions and explicitly does not claim a validated cohort yet.