One NBME score calculator per form22 calculators, Step 1 and Step 2 CKNo account needed

NBME Score Calculator for Step 1 and Step 2 CK

This NBME score calculator takes the questions you missed, or the percent you got right, on any CBSSA, CCSSA, UWSA or Free 120 sitting and returns an estimated three-digit USMLE score with a pass probability. One page per form. Nothing to sign up for.

Find your NBME score calculator Combine several sittings

196 is the current USMLE Step 1 passing standard. 218 is the Step 2 CK standard used throughout this site.

Not affiliated with, endorsed by, or sponsored by the NBME® or USMLE®. Educational estimates only.

Convert a form now

Pick the form you sat and enter how many you missed.

Form

Wrong answers

0 to 200 questions

233estimated Step 1 score

80.0% correct · 99% estimated pass probability

37 points above the 196 passing standard

Full NBME 25 breakdown

22: NBME score calculator pages
2: Exams covered end to end
196 / 218: Passing standards used
0: Accounts, uploads, or fees

Which form did you sit? Pick its NBME score calculator

There is one NBME score calculator per assessment, because the forms do not convert alike. Every page takes a wrong-answer count or a percent correct and returns a modelled estimate, not official NBME output.

Step 1 CBSSA forms 25 to 31

One NBME score calculator per Step 1 form: seven CBSSA papers, 200 questions each, scored against 196.

NBME 25

The NBME score calculator for CBSSA 25: 73 misses still reaches 196.

NBME 26

Form 25’s ceiling, steeper slope: this NBME score calculator stops at 71.

NBME 27

Ceiling of 275, and 60 misses on this NBME score calculator comes back 208.

NBME 28

The gentlest slope of the seven. Its NBME score calculator still passes 75 misses.

NBME 29

Ceiling of 272, and this NBME score calculator stops passing at 70 misses.

NBME 30

Ceiling 279, steepest slope. The NBME score calculator that charges most per miss.

NBME 31

Newest Step 1 form, tightest line: 69 misses on this NBME score calculator.

Step 1 Free 120 and UWSA

Shorter sets on their own scales: one NBME score calculator each for 120 and 160 questions.

Free 120

The official 120-question set. This NBME score calculator tops out near 220.

UWSA 1

A UWorld form on the same NBME score calculator engine: 89 of 160 still clears 196.

UWSA 2

Higher UWorld ceiling. The NBME score calculator passes up to 92 misses.

Step 2 CK CCSSA forms 9 to 15

One NBME score calculator per Step 2 CK form: seven CCSSA papers, scored against 218.

NBME 9

Oldest CCSSA form, lowest ceiling: this NBME score calculator clears 218 at 74.

NBME 10

A 300 ceiling with one of the steepest penalties on any NBME score calculator.

NBME 11

Shallow slope, 300 ceiling. This NBME score calculator forgives the middle.

NBME 12

Form 10’s ceiling, gentler cost per miss on this NBME score calculator.

NBME 13

Gentlest CCSSA slope: the NBME score calculator puts 60 misses at 235.

NBME 14

Slope sits between Forms 13 and 15. An NBME score calculator with no surprises.

NBME 15

Newest CCSSA form. This NBME score calculator runs past 300 for a perfect paper.

Step 2 CK Free 120 and UWSA

The official Step 2 CK Free 120 and both UWorld sittings, an NBME score calculator each.

Free 120

The Step 2 CK NBME score calculator for the official Free 120: 39 misses reaches 218.

UWSA 1

Percent-anchored UWorld curve; this NBME score calculator adds a realistic range.

UWSA 2

160 questions, shallow curve. The NBME score calculator still reaches 218 at 73.

Cross-form score converters

Two or three results already? One NBME score calculator puts a whole exam on one scale.

Step 1 Converter

One NBME score calculator across CBSSA 25–31, every sitting on one scale.

Step 2 CK Converter

One NBME score calculator across CCSSA 9–15, every sitting on one scale.

How the NBME score conversion works, form by form

An NBME score calculator converts a raw self-assessment result into an estimated three-digit USMLE score. CBSSA forms for Step 1, CCSSA forms for Step 2 CK, UWorld’s self-assessments and both Free 120 sets report only wrong answers or percent correct. The conversion is what makes those numbers comparable.

A stack of answer sheets on the left, part of its bubble grid filled in orange, with a broad curved arrow sweeping from the sheets to a tick-marked dial arc on the right.

Each form gets its own fitted line. On the seven current Step 1 CBSSA forms a perfect paper starts between 270 and 279 and every miss costs roughly 1.05 to 1.15 points, so the NBME score calculator for Form 31 returns 206 for 60 misses while Form 28 returns 211 for identical work.

Five points is easy to shrug off in conversation and hard to ignore when it falls either side of moving a test date. Convert on the NBME score calculator built for that exact form first, compare second, and read how each form’s conversion was built.

Step 1 has been reported as pass/fail since January 2022, so a Step 1 estimate is a study signal rather than anything a program will read. Step 2 CK still returns a real three-digit score, which is where tracking an NBME score calculator estimate across a dedicated block earns its keep.

Sat more than one form? Convert any Step 1 form on one scale, convert any Step 2 CK form on one scale, or combine several practice scores into one prediction.

NBME score conversion chart: 60 misses on every form

One input through every form shows why a single generic converter would mislead you. Each row is what that NBME score calculator returns.

NBME score calculator	Exam	60 wrong	Passes up to
NBME 25	Step 1	210	73
NBME 26	Step 1	209	71
NBME 27	Step 1	208	71
NBME 28	Step 1	211	75
NBME 29	Step 1	207	70
NBME 30	Step 1	210	72
NBME 31	Step 1	206	69
NBME 9	Step 2 CK	233	74
NBME 10	Step 2 CK	234	75
NBME 11	Step 2 CK	235	75
NBME 12	Step 2 CK	235	75
NBME 13	Step 2 CK	235	75
NBME 14	Step 2 CK	234	75
NBME 15	Step 2 CK	235	75

Shorter sets sit on their own scales, so a bare percentage travels badly: 60 misses of 120 is 183 on the Step 1 Free 120 and 189 on the Step 2 CK set. Use the NBME score calculator built for the form you sat.

Where 196 and 218 sit, and what margin is enough

Every NBME score calculator here measures one distance: from your estimate to 196 for Step 1, or to 218 for Step 2 CK.

The Step 1 curve is steep on purpose. Five points clear of 196 reads near 71% on the model behind each NBME score calculator, and ten points clear reads near 86%. Those percentages describe the curve, not a measured cohort.

Passing and safe are different questions, and treating them as one is the most expensive mistake in a dedicated block. Two points over the line is a coin toss wearing a number. Margin is what makes a result trustworthy, and it has to hold on a second form a week later.

Where a three-digit score sits: Step 2 CK percentile

A number means little alone. Drop in a Step 2 CK score, real or estimated by any NBME score calculator here, and see roughly where it falls.

Exam

Three-digit score

Enter a score between 1 and 300 to see where it lands.

Modelled as a normal curve with a mean near 249 and a standard deviation near 15, rounded from published USMLE summaries. Approximate, not an official rank.

How many days are left, and what that changes

Set your test date once; it stays on this device. The days left decide what an NBME score calculator result should make you do next.

Your test date

Pick a date to see the days remaining.

A clock face with two plain hands and no numerals, its rim partly filled by a thick orange countdown arc.

What an estimate can tell you, and where it stops

Every figure comes from a curve fitted to one form, not from the NBME’s own equating — the honest answer to how accurate an NBME score calculator can be. Here is what the estimate rests on, and what it cannot see.

One fitted curve per form, never an average

Each page uses the coefficients fitted to that assessment alone. An NBME score calculator built on the average of seven forms would be wrong on all seven.

No official conversion exists to check against

The NBME publishes no wrong-answers-to-score formula for its self-assessments, so no NBME score calculator can be validated against its internal equating.

The coefficients behind each NBME score calculator

The conversion never leaves your browser

Converting a wrong-answer count is arithmetic, so it runs on your device. No NBME score calculator here uploads anything or asks for an account.

Both input shapes, any screen

Some score reports give a wrong-answer count, some give a percent. Every NBME score calculator here takes either, on a phone or a laptop.

The reference you get on exam day

Normal ranges are supplied in the real testing interface, so a form sat without them is a harder form than the one you will meet.

The lab values sheet you get in the exam

Where the estimate stops and the work starts

An NBME score calculator result is only worth having if it changes tomorrow. The schedule builder turns the estimate and your test date into a plan.

Turn a score into a study schedule

What a free NBME score calculator should include

Prep dashboards often put this arithmetic behind a subscription. Every NBME score calculator here is on the page, with the numbers it runs on written down.

FeaturePaid dashboardsThis site

An NBME score calculator for every current formOften paid

Wrong answers or percent correct as the inputOften paid

Pass probability against 196 or 218Often paid

A forecast that weighs several sittingsOften paid

The exam lab values reference sheetOften paid

Published coefficients you can checkOften paid

Usable without an accountOften paid

Describes a common pattern, not any named competitor.

When a score conversion changes, hear about it

NBME retires forms and releases new ones, and every NBME score calculator here moves with them. Occasional email, one click to leave.

Questions students ask before trusting a number

How do I choose the right NBME score calculator?: Use the page for the exact assessment you sat: CBSSA 25 to 31 for Step 1, CCSSA 9 to 15 for Step 2 CK, one page each for UWSA and Free 120. Sat several? One cross-form NBME score calculator puts them on a single scale.
Can I enter percent correct instead of wrong answers?: Yes — every NBME score calculator here takes either. On a 200-question form, 42 wrong and 79% correct describe the same sitting and return the same estimate.
Is 196 still the passing score for Step 1?: 196 is the current USMLE Step 1 passing standard, and the line every Step 1 NBME score calculator scores against. Step 1 is pass/fail, so the estimate shows your margin rather than your number.
What is a passing score on the Step 2 CK self-assessments?: 218 is the Step 2 CK standard every NBME score calculator here centres its pass probability on. On the 200-question CCSSA forms that line sits at 74 to 75 wrong answers. Standards get revised, so confirm on usmle.org if you are near it.
Is this an official NBME score conversion?: No. The NBME publishes no wrong-answers-to-score formula for its self-assessments, so no NBME score calculator anywhere, including this one, is official. These are models built on community-reported results.
How accurate is an NBME score calculator?: Accurate enough to guide a decision, not to defend a single point. Nobody outside the NBME can validate these models, so this NBME score calculator quotes no accuracy figure. Read the estimate as a range, and trust a trend over any one result.

Open the NBME score calculator for your form

You already have the raw number. The NBME score calculator for that form turns it into a three-digit estimate and a pass probability against 196 or 218, in a few seconds, for nothing.

Open an NBME score calculator Weigh several forms

Not affiliated with, endorsed by, or sponsored by the NBME® or USMLE®. Educational estimates only.