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 based on 1,200+ historical Step takers. No more 'you'll get a 240' fake precision.
Weak areas
Day 7
Final push
Personalized Final Push
Get a day-by-day study plan based on your weak subjects and days left until exam. Free preview, full plan in the PDF report.
Live demo
Try the Predictor Live
Add your scores. See your range instantly. No signup.
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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.
Built on Real Data, Validated Daily
We started small and we'll always be honest about it. Our dataset grows every day from anonymous user reports.
0
Historical Step Takers
Real NBME → Step pairs in our dataset
±0 pts
Median Prediction Error
Based on holdout validation
0
Predictions This Month
And growing every day
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 + 14-day plan 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
- 14-day study plan
- 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
- 14-day personalized study plan
- Subject-level weakness map
- Score trajectory analysis
- Multi-Step tracking
- Unlimited refreshes
Coming Soon
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 help you understand why. Every guide is written by current med students and reviewed by US-trained physicians.
To get you started, here are our top guides:
MAY 17, 2026•8 MIN READ
NBME Score Conversion: The Complete 2026 Guide
Everything you need to know about converting NBME 28-32 raw scores to predicted Step 1 and Step 2 CK scores.
Read more
MAY 10, 2026•5 MIN READ
How to Read a Confidence Interval (For Med Students)
Why one number isn't enough — and how to use a 95% CI to plan your final 2 weeks of prep.
Read more
MAY 5, 2026•6 MIN READ
UWSA vs NBME: Which Predicts Step Better?
We pulled 1,200+ self-reports from r/Step1 and r/Step2 and ran the numbers. Results inside.
Read moreReviewed by physicians
Validated by Real US-Trained Physicians
Each algorithm update is reviewed by licensed MDs who scored 250+ on their own Step 2 CK. We're actively expanding our advisor board.
Dr. M. Chen, MD
Internal Medicine, PGY-2
Step 2 CK: 256
Reviewed our Step 2 CK conversion table and weak-subject mapping algorithm.
Dr. A. Okafor, MD
Pediatrics Resident
Step 2 CK: 261
Validates our pediatrics subject estimates against real exam recall.
Anonymous, M4
US MD candidate
Step 2 CK: 268 (verified)
Provided the original 1,200-sample dataset that powers our base model.
Reviewer identities will be public once each advisor signs our public profile. Until then, we use placeholder names. We never claim unaffiliated endorsements.
Frequently Asked Questions
Updated May 17, 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 17, 2026
How to Cram from a Low NBME 25 in 5 Days
A targeted approach used by 12 students who improved 15+ points in their final week.
MAY 12, 2026
The 7 Most Tested Topics on Step 2 CK in 2026
Based on community recall from 800+ test-takers in the past 90 days.
MAY 10, 2026
Why Your NBME Average Lies (And What to Use Instead)
Why a simple average across NBMEs is misleading — and how to weight by recency.
MAY 8, 2026
Cheapest Step 2 Question Banks in 2026
UWorld vs AMBOSS vs Kaplan vs USMLE-Rx — pricing, value, and free trials compared.
MAY 5, 2026
Free 120 vs Real Step 2 — Honest Difficulty Comparison
Real test-takers tell us what surprised them on test day vs the free official material.
MAY 1, 2026
What to Do the Night Before Step 2 CK
The science (and superstition) behind exam-eve routines that work.