The Free 120 Step 2 CK Score Calculator converts your percentage correct into a predicted 3-digit Step 2 CK score using the formula: Score = (% Correct × 1.7) + 104.
Take it in the final 1–2 weeks before your exam, right after UWSA 2, as a last content-calibration check on officially retired USMLE questions.
The Free 120 is known to run easier than the real exam — students typically score 5–10% higher here than on NBME CCSSA forms, so treat this prediction as a floor, not a ceiling.
Enter your score below for an instant prediction, pass probability against the 218 threshold, and a free downloadable PDF report.
Enter Your Free 120 Score
Free 120 Step 2 CK works best when taken 1–2 weeks before your exam date, right after your dedicated content review wraps up. For the most reliable readiness picture, pair this result with your UWSA 2 Step 2 score or a recent NBME CCSSA Form 9 attempt before making your final exam-date decision.
This calculator converts your Free 120 Step 2 CK percentage into a predicted 3-digit score and pass probability against the 218 threshold. Since the Free 120 tends to run easier than the real exam, treat your result as a conservative floor — and check our full Step 2 CK calculator suite to track every practice exam.