NBME 30 Score CalculatorStep 1's Hardest — and Most Trustworthy — Form
200 questions · The most conservative Step 1 predictor available. Enter your wrong answers to get your NBME 30 predicted score and understand what it means for your real exam readiness.
NBME 30 Slightly Underpredicts — No Downward Adjustment Needed
Unlike UWSA forms (which overpredict by 7–15 pts), NBME 30 tends to slightly underestimate your actual Step 1 score by ~3–5 pts. Your real exam result will often land at or above your NBME 30 predicted score. A passing score here is the strongest single readiness signal available.
Why NBME 30 Scores Lower Than Other Forms
Each wrong answer on NBME 30 costs 1.15 points — the highest penalty of any active Step 1 form. On NBME 28 (the easiest active form), the cost is only 1.05 points per wrong answer. This means:
A lower NBME 30 score vs. an easier form does not mean you regressed — it reflects the more demanding scoring curve. Compare scores only within the same form.
NBME 28 / 29 / 30 / 31 — Difficulty Comparison
| NBME 28 | NBME 29 | NBME 30 | NBME 31 | |
|---|---|---|---|---|
| Slope (pts/wrong) | 1.048 | 1.09 | 1.15 | 1.08 |
| Difficulty | Easy | Moderate | Hardest | Hard |
| Recommended timing | Week 5–6 | Week 6–7 | Final 1–2 wks | Final 1–2 wks |
| Primary use | Confidence | Readiness | Final checkpoint | Content check |
Community consensus data. Slope values from regression formulas calibrated against reported score pairs on r/step1 and SDN.
NBME 30 Score Conversion Table — Step 1
| Wrong | Correct | % Correct | Predicted Score | Pass Prob |
|---|---|---|---|---|
| 0 | 200 | 100% | 278 | 99.9% |
| 5 | 195 | 97.5% | 272 | 99.9% |
| 10 | 190 | 95% | 266 | 99.9% |
| 15 | 185 | 92.5% | 260 | 99.9% |
| 20 | 180 | 90% | 255 | 99.9% |
| 25 | 175 | 87.5% | 249 | 99.9% |
| 30 | 170 | 85% | 243 | 99.9% |
| 35 | 165 | 82.5% | 237 | 99.9% |
| 40 | 160 | 80% | 232 | 99.8% |
| 45 | 155 | 77.5% | 226 | 99.6% |
| 50 | 150 | 75% | 220 | 98.7% |
| 55 | 145 | 72.5% | 214 | 96.2% |
| 60 | 140 | 70% | 209 | 91.2% |
| 65 | 135 | 67.5% | 203 | 77.9% |
| 70 | 130 | 65% | 197 | 54.5% |
| 75 | 125 | 62.5% | 191 | 28.9% |
| 80 | 120 | 60% | 186 | 14.2% |
| 85 | 115 | 57.5% | 180 | 5.3% |
| 90 | 110 | 55% | 174 | 1.9% |
| 95 | 105 | 52.5% | 168 | 0.6% |
| 100 | 100 | 50% | 163 | 0.3% |
| 105 | 95 | 47.5% | 157 | 0.1% |
| 110 | 90 | 45% | 151 | 0.1% |
| 115 | 85 | 42.5% | 145 | 0.1% |
| 120 | 80 | 40% | 140 | 0.1% |
| 125 | 75 | 37.5% | 140 | 0.1% |
| 130 | 70 | 35% | 140 | 0.1% |
| 135 | 65 | 32.5% | 140 | 0.1% |
| 140 | 60 | 30% | 140 | 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 30
Most challenging active Step 1 form — best final predictor.
Hardest scoring form (1.15 pts/question). A passing score here is the strongest signal of exam readiness.
Other Step 1 Practice Exams
NBME 30 Step 1 Calculator — FAQ
This tool is for educational purposes only. Not affiliated with NBME® or USMLE®. Predictions carry an estimated error of ±5–10 points. No peer-reviewed study has published R² or bias data specific to NBME 30; accuracy figures reflect community consensus from r/step1 and SDN forums.