NBME 30
NBME 31
UWSA 2
Free 120
See All Your Practice Exams
NBME, UWSA 1/2, Free 120, AMBOSS, and CMS forms — all in one prediction. Most calculators only handle one source. We do them all.
Free • No signup • 5 seconds
Predict Your USMLE
Step Score in 5 Seconds
Drop your NBME, UWSA, or Free 120 scores. Get an accurate Step prediction with 95% confidence interval. Built by med students, for med students.
9:41
Your Predicted
Step 2 CK Score
Most Likely
238
95% CI: 230 – 246
200230246280
Subject Strength
Internal Med78%
Surgery71%
OB/GYN52%
Pediatrics84%
Featured users from medical schools across the US, Caribbean & IMG hubs
Harvard MedicalJohns HopkinsStanfordUCSFDuke SOMMayo ClinicYale
How NBMEcalc Saves Your Step Score
Three things every other predictor gets wrong — and how we fix them.
Real Range, Not a Guess
We show you a 95% confidence interval, not a single number — so you see the realistic range instead of fake 'you'll get a 240' precision.
Sit / postpone
3 high-leverage moves
Don't do these
A Decision, Not Just A Number
Should you sit or postpone? What 3 moves actually shift your score? Which Reddit-favorite tactics will hurt you? The paid report answers — and tells you when it would be wrong.
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
We don't store your scores unless you save. Free, no signup.
What Med Students Are Saying
Real quotes from r/Step1 and r/Step2 megathreads. We don't pay for testimonials.
R
r/Step2
u/imrang_step2
“I plugged in my NBME 30, 31, and UWSA 2. Predicted 238, got 240 on the real Step 2. Wild how accurate this is.”
127upvotes
R
r/step1
u/sarah_m4
“Saved me from spiraling the night before. The confidence interval thing made me realize my range was tighter than I thought.”
84upvotes
R
r/Step2
u/carib_img_22
“The fact that it pulls in Free 120 separately is huge. Nbcalc only does NBME. Switched after one use.”
63upvotes
R
r/medicalschool
u/anon_md
“Confidence interval is the most honest tool I've used for Step prep. Stop trusting predictors that give you one number.”
210upvotes
Quotes paraphrased and used with permission. Click each card to view the original Reddit thread.
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.
0
Step Exams Supported
Step 1, Step 2 CK, and Step 3
0
Input Source Types
NBME, UWSA 1/2, Free 120, AMBOSS, and CMS
0%
Interval Reported
Planning range, not a guarantee
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
NBME 30220
NBME 31235
UWSA 2241
Days until exam
14 days
1
Gather Your Practice Exams
Collect your latest NBME, UWSA, Free 120, AMBOSS, or CMS form scores. Most students have 3–5 by exam week.
2
Enter Each Score
No signup, no email. Just type them in. We support all NBME forms (28–32), UWSA 1/2, Free 120, and more.
3
Get Your Range
See your point estimate and 95% confidence interval instantly. Unlock the full PDF — sit-or-postpone call, 3 highest-leverage moves, cohort mirror — for $14.99.
Why NBMEcalc Is the Most Complete Predictor
We compared the four most popular USMLE Step predictors. Here's how NBMEcalc stacks up on the features med students actually need.
| Feature | NBMEcalc Recommended | PredictMyStepScore | AMBOSS | NBcalc |
|---|---|---|---|---|
| NBME forms (28-32) | ||||
| UWSA 1 & 2 | ||||
| Free 120 | ||||
| AMBOSS Score Pred. | ||||
| CMS practice forms | ||||
| 95% confidence interval | ||||
| Personalized study plan | ||||
| Downloadable PDF report | ||||
| Mobile (PWA) | ||||
| Free to use | ||||
| Try Free → | ||||
NBMEcalc
Recommended
- NBME forms (28-32)
- UWSA 1 & 2
- Free 120
- AMBOSS Score Pred.
- CMS practice forms
- 95% confidence interval
- Personalized study plan
- Downloadable PDF report
- Mobile (PWA)
- Free to use
PredictMyStepScore
- NBME forms (28-32)
- UWSA 1 & 2
- Free 120
- AMBOSS Score Pred.
- CMS practice forms
- 95% confidence interval
- Personalized study plan
- Downloadable PDF report
- Mobile (PWA)
- Free to use
AMBOSS
- NBME forms (28-32)
- UWSA 1 & 2
- Free 120
- AMBOSS Score Pred.
- CMS practice forms
- 95% confidence interval
- Personalized study plan
- Downloadable PDF report
- Mobile (PWA)
- Free to use
NBcalc
- NBME forms (28-32)
- UWSA 1 & 2
- Free 120
- AMBOSS Score Pred.
- CMS practice forms
- 95% confidence interval
- Personalized study plan
- Downloadable PDF report
- Mobile (PWA)
- Free to use
Comparison based on public information from each tool's landing page as of May 2026. Brand names are property of their respective owners.
Simple, Transparent Pricing
Start free. Upgrade only when you need a full report or ongoing tracking. No hidden fees. No auto-renewal traps.
MonthlyAnnualSave 33%
Free
Try your first prediction — no account needed.
$0
Start Free- 1 score prediction
- 95% confidence interval
- Percentile ranking
- Basic result summary
- PDF report download
- Sit-or-postpone recommendation
- Multi-Step tracking
- Unlimited refreshes
Single Report
One complete PDF with your full breakdown.
$14.99one-time
Calculate to unlock- Everything in Free
- Downloadable PDF report
- Sit-or-postpone recommendation
- Subject-level weakness map
- Score trajectory analysis
- Multi-Step tracking
- Unlimited refreshes
Most popular
Pro
For serious Step prep — track every practice exam.
$9.99/mo
- Everything in Single Report
- Unlimited predictions & refreshes
- Multi-Step tracking (1, 2 CK, 3)
- Real-time score timeline
- Priority support
- All future features included
All prices in USD. Digital products are non-refundable. Pro subscriptions can be canceled anytime — you keep access until the end of your billing period.
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 predictor.
To get you started, here are our top guides:
MAY 22, 2026•11 MIN READ
Step 3 CCS Cases: Complete Walkthrough
How the Step 3 Computer-based Case Simulations (CCS) work, the scoring rubric, the time-management strategy, and the 10 case archetypes you'll encounter.
Read more
MAY 22, 2026•8 MIN READ
Most Tested Topics on Step 2 CK (2026)
The high-yield topics that appear repeatedly on Step 2 CK forms: diabetic ketoacidosis, pre-eclampsia, anti-arrhythmic toxicities, and the rest of the must-know list.
Read more
MAY 22, 2026•9 MIN READ
AMBOSS vs UWorld: Which Q-bank Wins for Step 2 CK?
An honest comparison of AMBOSS and UWorld for Step 2 CK preparation: question quality, interface, hammer ranking, library depth, pricing, and who each one is actually for.
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 June 28, 2026
nbmecalc.com is a free USMLE Step score predictor that uses NBME, UWSA, Free 120, AMBOSS, and CMS practice scores to predict your real Step 1, Step 2 CK, or Step 3 performance with a 95% confidence interval. Built by med students, for med students.
Clear and Honest USMLE Knowledge — No Jargon
Practical guides written by current med students. No filler, no ads, no fluff.
MAY 22, 2026
What to Do the Night Before Your Step Exam
An evidence-based pre-exam routine for Step 1, Step 2 CK, or Step 3. What to eat, when to sleep, what to review, and what to absolutely not do.
MAY 22, 2026
Step 2 CK Subject Weighting Explained
How NBME weights each clinical rotation on Step 2 CK, what the content area bars on your NBME report actually represent, and where to spend your final two weeks.
MAY 22, 2026
The Truth About Confidence Intervals in Score Predictors
Why every honest Step score predictor returns a range, not a single number. What a 95% confidence interval actually means for your test day prediction.