NBME % correct ↔ 3-digit score
Took an NBME form offline? Convert your raw percent correct to the 3-digit score the online version would have reported — or go the other way. Type in either box; the other updates, along with a predicted Step 2 CK score. Works for NBME 9 through 16.
≈ — predicted on Step 2 CK refine with all your tests →
Calibrated on real reports listing both a percent and a 3-digit NBME 14 score, blended with published conversions (typically within about ±3 points).
| NBME 14 % correct | Est. 3-digit score |
|---|---|
| 50% | 191 |
| 55% | 202 |
| 60% | 213 |
| 65% | 224 |
| 70% | 234 |
| 75% | 245 |
| 80% | 256 |
| 85% | 267 |
| 90% | 278 |
| 95% | 289 |
Each form's predicted Step 2 assumes typical timing; the full predictor uses your exact timing and every other test. See each form's full breakdown: NBME 9 · NBME 10 · NBME 11 · NBME 12 · NBME 13 · NBME 14 · NBME 15 · NBME 16.
How the conversion works
When you take an NBME self-assessment online, NBME turns your raw performance into a 3-digit score with a fixed, form-specific scoring table. Offline takers never see that step — they only have a percent correct. This tool reverse-engineers the mapping: a shared slope of about 2.2 points per percent (corroborated by our cleanest forms and by published conversions) plus a per-form offset for difficulty, fit on real r/Step2 reports that listed both a percent and a 3-digit score and blended with published conversions.
Common questions
How do I convert an NBME percent correct to a 3-digit score?
Pick your form and enter your raw percent correct. NBME Step 2 forms have 200 questions, so each is worth about half a percent. The tool maps your percent to the 3-digit form score (about 2.2 points per percent, calibrated on real reports and blended with published conversions), then to a predicted Step 2 CK score. It works both ways — enter a 3-digit score to get the equivalent percent correct.
Why does the same percent give a different score on different forms?
Each NBME form has its own scoring curve, so a given percent maps to a slightly different 3-digit score depending on the form. The differences are small (usually within a couple of points), but the converter applies the specific curve for the form you select.
How accurate is the percent-to-score conversion?
On forms with enough data the leave-one-out error is about 2 to 3 points. Two newer forms have thinner data: NBME 15 is approximate and NBME 16 is preliminary (anchored to the recent forms).
Get a real prediction, not a rule of thumb
The full predictor combines all of your practice tests with their timing, shows calibrated probability ranges, and was the most accurate of every predictor tested against real scores. See the head-to-head comparison.