NBMECalculator is a lightweight score estimation tool for students preparing for USMLE Step 1 and Step 2 CK.
Last updated: May 11, 2026
NBMECalculator helps medical students turn practice exam performance into a practical readiness estimate for USMLE Step 1 and Step 2 CK.
You can enter wrong answers or percent correct for supported NBME, UWSA, and Free 120 forms. The calculator returns an estimated 3-digit score, pass probability, and readiness signal.
The calculator uses community-derived regression formulas and public score conversion references. Each supported form has its own difficulty curve, so the same number of wrong answers may produce different estimates across forms.
Predictions are best used as planning signals. They are not official scores and should be cross-checked with multiple practice exams before making scheduling decisions.
NBMECalculator is an independent educational tool. It is not affiliated with, endorsed by, or sponsored by NBME, USMLE, FSMB, ECFMG, or any exam administrator.
NBME and USMLE names are referenced only to identify the exams and practice forms students are already using.
Calculations run in your browser. The score inputs you enter are not submitted to a server for calculation.
If you save scores, they are stored locally in your browser storage so you can track progress on the same device.