NBMEcalc
Interpret CMS form results and plan Step 2 CK study by clinical subject.
A startup from the United States that is founded by Jacky Jian.
Interpret CMS form results and plan Step 2 CK study by clinical subject.
A startup from the United States that is founded by Jacky Jian.
This page is designed to help you find out whether NBMEcalc is good and if it is the right choice for you.
NBMEcalc helps medical students interpret Clinical Science Mastery Series (CMS) form results during USMLE Step 2 CK preparation. Enter a CMS score or percent-correct result to review subject-level study signals across Internal Medicine, Surgery, Pediatrics, Obstetrics and Gynecology, Psychiatry, and Family Medicine.
The guide explains how CMS reports can inform rotation-specific study priorities and why a subject-focused CMS result should not be treated as a direct official Step 2 CK score conversion. Learners can use the resource alongside comprehensive readiness assessments when planning their next study block.
NBMEcalc is free to access in a browser. It is an independent educational planning resource and is not affiliated with, endorsed by, or sponsored by NBME or USMLE.
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Free to Use
NBMEcalc's CMS converter tool appears to be freely accessible, allowing medical students to convert their NBME practice exam scores without any cost, making it accessible to a wide range of users preparing for USMLE exams.
Quick Score Estimation
The tool provides a fast way for students to estimate their potential USMLE Step scores based on NBME self-assessment results, saving time compared to manual calculations or guesswork.
Simple Interface
The website is designed with a straightforward, easy-to-navigate interface that allows users to input their NBME scores and quickly receive converted estimates without technical complexity.
Useful for Exam Preparation
By providing score conversions, the tool helps medical students gauge their readiness for actual board exams and identify areas that may need additional study before test day.
Accessible Online
As a web-based tool, it can be accessed from any device with internet connectivity, making it convenient for students to check their scores anytime during their study process.
NBMEcalc combines multiple practice assessment sources—including NBME, UWSA, Free 120, AMBOSS Self-Assessment, and CMS—into one USMLE planning range. Instead of presenting a single “magic” score, it shows a 95% confidence interval, supports Step 1, Step 2 CK, and Step 3, and makes its methodology and limitations public.
NBMEcalc is designed for students who want to interpret several practice assessments together rather than relying on one score in isolation. The core predictor is free, works without registration, supports multiple assessment sources, and clearly communicates the uncertainty around every estimate.
NBMEcalc is built for medical students and graduates preparing for USMLE Step 1, Step 2 CK, or Step 3. It is especially useful for test-takers who have results from several practice assessments and need a clearer view of their score range, pass readiness, and study trajectory.
NBMEcalc began in late 2025 after frustration with closed-source score predictors and one-size-fits-all advice. The first prototype was created to combine multiple practice assessment sources into a more transparent planning range. The project later added a public methodology, confidence intervals, free score prediction, downloadable reports, and multi-exam tracking.
NBMEcalc is a responsive browser-based application built with Next.js, React, and TypeScript. It uses statistical score-normalization and weighting logic to combine multiple practice assessment results. The application is mobile-friendly and can be used directly in a web browser without installing native software.
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