The NBME 28 Step 1 Score Conversion Calculator uses the formula: Score = 274.14 − 1.0456 × wrong answers. This formula was derived using linear regression from six real student-reported data points: 31 wrong = 242, 39 wrong = 233, 47 wrong = 225, 53 wrong = 219, 61 wrong = 210, and 73 wrong = 198. The regression achieves near-perfect R² = 0.9996 fit across all six points, confirming the model’s accuracy. Each wrong answer on NBME 28 reduces your predicted score by approximately 1.05 points — making NBME 28 the most lenient scoring form among NBME 25–31. The passing threshold of 196 corresponds to approximately 75 wrong answers (62.5% correct).

The NBME 28 formula is highly accurate for predicting your NBME 28 performance itself — matching all six verified data points exactly. However, NBME 28 is widely recognized as the easiest scoring form, so it typically overpredicts real Step 1 scores by 3–5 points. Students taking NBME 28 two to four weeks before Step 1 generally find their actual exam falls slightly lower. The correlation between NBME 28 predicted scores and actual Step 1 outcomes is approximately R² = 0.72–0.80. Use NBME 28 as a confidence booster after harder forms (NBME 26/27/29/30), not as your sole readiness indicator.

Using the verified NBME 28 formula (274.14 − 1.0456 × wrong): Score 242: 31 wrong (84.5% correct). Score 235: approximately 37 wrong (81.5% correct). Score 230: approximately 42 wrong (79% correct). Score 225: 47 wrong (76.5% correct). Score 220: approximately 52 wrong (74% correct). Score 219: 53 wrong (73.5% correct). Score 210: 61 wrong (69.5% correct). Score 198: 73 wrong (63.5% correct). Score 196 (passing): approximately 75 wrong (62.5% correct). These targets are derived directly from the verified data-driven regression.

NBME 28 is best taken during weeks 5–6 of your dedicated Step 1 study period, approximately one to two weeks before your exam date — specifically as a confidence booster after taking harder assessments like NBME 26/27/29/30. The recommended 2026 sequence is: NBME 25 (weeks 2–3, baseline) → NBME 26 or 27 (weeks 4–5, mid-dedicated reality check) → NBME 28 (week 5–6, confidence boost) → NBME 29 or 30 (week 7, final predictor) → Free120 (week 8, format practice). Avoid taking NBME 28 as your last practice test — its easier difficulty may give false security. Pair it with a harder form for accurate final readiness assessment.

Because NBME 28 overpredicts by 3–5 points, apply these adjusted targets: 225 or higher on NBME 28 (47 wrong, 76.5% correct) gives strong confidence — true readiness approximately 220–222. 219 or higher (53 wrong, 73.5% correct) indicates solid passing ground — true readiness approximately 214–216. 210 or higher (61 wrong, 69.5% correct) is borderline — true readiness approximately 205–207, requires targeted work. For IMGs where every attempt matters, target 53 wrong or fewer on NBME 28 (score ≥ 219) as your minimum safety margin before scheduling Step 1. The official passing threshold (196) corresponds to 75 wrong answers on NBME 28.

NBME 28 and NBME 27 use similar formulas but differ in key ways: NBME 27 uses 275.17 − 1.1125 × wrong (each wrong = 1.11 points), while NBME 28 uses 274.14 − 1.0456 × wrong (each wrong ≈ 1.05 points). The practical difference: NBME 28 allows approximately 75 wrong to pass vs 71 wrong for NBME 27 — a meaningful 4-question buffer. Students consistently report NBME 28 feels easier, with more straightforward distractors, more classic high-yield presentations, and shorter vignettes. For this reason, use NBME 27 as a realistic mid-dedicated assessment and NBME 28 as a confidence-building tool in the final weeks before exam day.

NBME 28 contains exactly 200 scored questions, making percentage correct and wrong answers directly interchangeable: Wrong = 200 − (% Correct × 2). The bidirectional sync means entering either value instantly calculates the other, eliminating common manual errors. For example, entering 76.5% correct automatically fills in 47 wrong questions, predicting a score of 225. This prevents the frequent mistake of entering slightly mismatched values and receiving an inconsistent result.

After reviewing your NBME 28 performance: Below 196: Extend dedicated by two to three weeks regardless of NBME 28’s easier difficulty — you need significant content reinforcement. Focus on Pathoma, high-yield First Aid, and all UWorld incorrects. 196–210: Review every NBME 28 wrong answer block by block, identify recurring topic gaps, and take a harder form (NBME 29/30) in one to two weeks for a realistic readiness check. 210–225: Maintain your schedule, drill remaining UWorld blocks, and take NBME 29 or 30 within one week to validate true readiness. 225+: Great confidence boost — now validate with NBME 30 or UWSA2 to confirm you’re truly above passing on the real exam. Do not skip harder forms just because NBME 28 went well.

After submitting your email, five things happen automatically: (1) Your full score report unlocks with the predicted three-digit score and pass probability chart. (2) A PDF report is generated with NBMEScore.com branding. (3) Your score is added to the global leaderboard. (4) A personalized email is sent to your inbox with your NBME 28 score, weak area study tips based on your selections, and a dashboard access link. (5) Your personal dashboard unlocks with score trend tracking, exam countdown, NBME-to-Step-1 correlation table, and week-by-week study plan based on the exam date you entered. The dashboard is 100% free — no credit card required.

Since January 2022, USMLE Step 1 transitioned to Pass/Fail reporting, so three-digit scores are no longer reported or used for residency applications. The NBME 28 predicted score is useful only as a private readiness benchmark — to assess whether you are comfortably above the 196 passing threshold. Remember that NBME 28 overpredicts by 3–5 points, so mentally subtract that margin when interpreting readiness. For residency planning, Step 2 CK scores (which remain numeric) are significantly more important post-2022. Use NBME 28 to decide if you are ready to sit for Step 1, not as a competitive metric.