Which NBME Step 2 CK forms does this calculator support?

NBME 9, 10, 11, 12, 13, 14, 15, UWSA 1, and UWSA 2 — 9 forms in total. Retired forms are not included because community regression data is no longer reliable for them.

How accurate is the Step 2 CK score prediction?

Predictions carry an estimated margin of ±5–10 points — standard for community regression models. Treat the result as a planning estimate. Cross-reference with a second form before making scheduling decisions.

What's a safe Step 2 CK score for competitive specialties?

The community-accepted safe zone is 230+. Competitive specialties (Surgery, Dermatology, Orthopaedics, Neurosurgery) typically require 240+. The official passing threshold is 218 (effective July 1, 2025).

How does the 2026 format change affect score calculation?

As of May 7, 2026, Step 2 CK now uses 16 × 30-min blocks (same 9-hour total exam). The scoring scale and regression formulas are unaffected — this calculator remains valid.

Why does NBME 13 use a different formula than NBME 15?

Each NBME form is independently calibrated with a unique difficulty curve. The same number of wrong answers on different forms will yield different predicted scores. Always use the formula for the specific form you took.

Is my data saved or shared?

No. All calculations run in your browser. Saved scores go to localStorage only — nothing is sent to any server.

USMLE Step 2 CK

NBME Step 2 CK Score Calculator & Predictor

Free NBME Step 2 CK score calculator for USMLE 2026. Enter wrong answers from NBME 9–15, UWSA 1, or UWSA 2 — get your predicted 3-digit score instantly. No signup needed.

Form

Your Performance · NBME 13 (200 questions)

Wrong Answers

80% correct

0 wrong100 wrong200 wrong

Predicted Score

256

Passing threshold: 218

Excellent

Pass probability

99.9%

140▲ 218 passing300

Strong readiness. You're well above the safe zone — consider scheduling soon.

Wrong

160

Correct

80%

Accuracy

USMLE Step 2 CK Score Benchmarks

Passing

218

Safe Zone

230+

Step 2 CK reports a 3-digit score. Competitive specialties (Surgery, Dermatology, Orthopaedics) typically require 240+. Aim for the safe zone before scheduling.

As of May 7, 2026: Step 2 CK now uses 16 × 30-min blocks (same 9 hrs total). Score calculation is unaffected.