NBME 30
NBME 31
UWSA 2
Free 120
Combine Supported Assessments
Review supported CCSSA, UWSA 1/2, Free 120, and AMBOSS results in one prediction while keeping each assessment family distinct.
Free • No signup • 5 seconds
NBME Score Calculator —
Predict Your Step Score in 5 Seconds
Combine compatible CCSSA, UWSA, or Free 120 scores into an independent Step estimate with an estimated planning range. Review the assumptions before using it for a test-date decision.
No signupScores stay local until you calculatePublic assumptions
9:41
Your Predicted
Step 2 CK Score
Most Likely
238
Estimated range: 230 – 246
200230246280
Subject Strength
Internal Med78%
Surgery71%
OB/GYN52%
Pediatrics84%
Free result · No signup required
Live demo
Try the Predictor Live
Add your scores. See your range instantly. No signup.
Select your exam
Your practice exams
Scored ago
Scored ago
Scored ago
days
No signup required. Calculate clicks are logged to measure and improve the funnel; see Privacy for retention details.
What the Free Result Includes
A combined estimate, an explicit planning range, and the assumptions needed to interpret both.
A Range, Not False Precision
We show an estimated planning range beside the midpoint and publish how it is produced. It is an internal heuristic, not a validated 95% interval.
Readiness review
3 high-leverage moves
Avoid these
Decision Support, Not A Verdict
The free result keeps your estimate, planning range, and assumptions visible. Optional reports package personalized priorities for saving or printing.
Transparent About What the Model Can Do
The calculator exposes its assumptions and uncertainty. We do not claim a validated cohort until a reproducible dataset and holdout report are published.
3
Step Exams Supported
Step 1, Step 2 CK, and Step 3
6
Input Source Types
CCSSA, UWSA 1/2, Free 120, and AMBOSS
1
Public Methodology
Versioned assumptions and validation status
How to Predict Your Step Score
Three steps. Five seconds. No paywall to see your range.
9:41
Step 2 CK Predictor
Enter your scores
CCSSA Form 14235
CCSSA Form 15242
UWSA 2241
Days until exam
14 days
1
Gather Your Practice Exams
Collect compatible CCSSA, UWSA, Free 120, or AMBOSS results you want to review together.
2
Enter Each Score
No signup or email is required. Choose the exam step first so the calculator can show the compatible form and score options.
3
Get Your Range
See your point estimate and estimated planning range instantly. Keep using the calculator for free; printable reports and saved tracking stay optional.
Before you rely on a predictor
Check the Evidence, Not a Winner Badge
Predictor feature lists change and do not establish accuracy. These are the four checks NBMEcalc exposes so you can judge the result on its evidence and limitations.
Compatible inputs
Combine supported CCSSA, UWSA, Free 120, and AMBOSS results while keeping each assessment family distinct.
A range, not a promise
The free result includes a midpoint and model-generated planning range. It is not a verified 95% interval or an official score report.
Public assumptions
Source adjustments, recency weighting, known limits, and material corrections are documented in the public methodology.
A clear decision boundary
High-stakes scheduling decisions should be checked against official assessment feedback and your school or advisor's process.
Your Resource for All Things USMLE
We don't just predict — we explain assumptions, link official sources, and keep unreviewed drafts out of search until their claims can be checked.
Ready to run your scores? Go straight to the Step 1 predictor or the Step 2 CK score predictor. Have a percent correct from an NBME form? Use the NBME score conversion page. Not sure which assessment family you took? Start with the NBME self-assessment forms and score guide.
To get you started, here are our top guides:
OCTOBER 25, 2026•6 MIN READ
How Many Questions Are on Step 1? 2026 Format, Length and Breaks
Step 1 is an 8-hour exam of fourteen 30-minute blocks with up to 20 questions each (from May 14, 2026). See the old vs new format, time per question, breaks, and what the exam covers.
Read more
OCTOBER 25, 2026•7 MIN READ
Step 3 Exam Format: How Long Is Step 3 and How Many Questions?
Step 3 is a two-day exam: 232 questions on Day 1 (about 7 hours) and 180 questions plus 13–14 CCS cases on Day 2 (about 9 hours). See the block layout, breaks, scoring, and what each day tests.
Read more
OCTOBER 25, 2026•7 MIN READ
NBME CBSE and CCSE: What They Are and How to Read Your Score
The CBSE is NBME's school-administered Step 1-style exam; the CCSE is its Step 2 CK counterpart. See how each is scored, why old CBSE conversion charts no longer apply, and what the scores mean for readiness.
Read moreEditorial controls
Evidence and Review Status
NBMEcalc currently uses an internal editorial process. We do not claim named physician review until reviewer identities and scope can be verified publicly.
Official-source checks
Assessment families, score-report guidance, and passing standards are checked against current NBME and USMLE pages.
Versioned model changes
Material assumption changes are documented publicly. Stored predictions keep their algorithm version.
Corrections welcome
Readers can report factual or calculation concerns. Unsupported claims are corrected or removed rather than defended.
Read the public methodology and changelog or submit a correction.
Frequently Asked Questions
Updated August 7, 2026
nbmecalc.com is an independent USMLE planning tool that combines compatible Step 2 CCSSA, UWSA, Free 120, and AMBOSS results into a Step estimate with an estimated range. Current Step 1 CBSSA, CMS, and Step 3 CCMSA reports are interpreted on their own official scales.
Clear and Honest USMLE Knowledge — No Jargon
Practical, source-checked guides for Step planning. No filler and no unsupported certainty.
OCTOBER 25, 2026
NBME Shelf Exams Explained: Length, Scoring, and Percentiles
NBME shelf exams are 110-question clerkship subject exams scored as equated percent correct. See each exam's length, how scores and percentiles work, whether shelves are curved, and when results arrive.
OCTOBER 25, 2026
USMLE Score Report vs Transcript: How to Read and Send Yours
Your USMLE score report is for you; programs and boards need your transcript. See what each shows, how long the score report stays online, and how to send your transcript to ERAS through FSMB ($70 per cycle).
SEPTEMBER 29, 2026
How Many Questions Are on Step 2 CK? 2026 Format and Unscored Items
Step 2 CK now has sixteen 30-minute blocks of up to 20 questions (from May 7, 2026). See the old vs new format, time per question, break time, and what USMLE says about unscored items.
MAY 22, 2026
Step 3 CCS Cases: How Many, How They're Scored, and How to Practice
Step 3 has 13–14 CCS cases on Day 2, each capped at 10 or 20 minutes of real time. See how USMLE scores them, the six official practice cases, and a case-by-case review checklist.
MAY 22, 2026
Step 2 CK High-Yield Priorities from the Official Content Outline
Build a Step 2 CK review order from current USMLE system and physician-task ranges instead of an unverifiable list of recalled questions.
MAY 22, 2026
AMBOSS vs UWorld for Step 2 CK: A Source-Checked Decision Guide
Compare the Step 2 CK features each product currently documents, then choose by study workflow, remaining time, and the resources you already own.
MAY 22, 2026
What to Do the Night Before Your Step Exam
A practical USMLE test-day checklist built around the official permit, identification, security, belongings, and break rules.
MAY 22, 2026
Step 2 CK Subject Weighting: What the Official Outline Says
Use the official USMLE system, physician-task, and clinical-science ranges to prioritize Step 2 CK review without inventing a fixed topic list.
MAY 12, 2026
How to Read Your NBME Score Report (Without Panicking)
A source-backed guide to reading current CBSSA and CCSSA score reports without mixing Step 1 EPC, Step 2 CK total scores, score ranges, or pass probabilities.
The calculator stays free
Optional upgrades add downloadable reports, saved history, and long-term Step tracking. You do not need a plan to calculate your score and review its planning range.