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Step 1 self-assessment estimator

NBME 31 Score Calculator: The Lowest Curve of the Set

The NBME 31 score calculator returns the most conservative estimate of the seven Step 1 forms here: 270 for a clean sheet, and 196 at 69 wrong out of 200.

200 questionsPassing ≈ 196Runs in your browser

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

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Any way you have it — wrong answers, percent correct, or a score you were already given.

= 85.0% correct • 170 correct

Enter your result and press Calculate to see your estimated three-digit score, pass probability, and what the result means.

Quick take on this form

Form 31 is the newest Step 1 CBSSA form here and the most conservative, which is why the NBME 31 score calculator reads below every sibling at every wrong count: 270.48 minus 1.08 per miss. Twenty wrong gives 249 against 256 on Form 30.

NBME 31 score reference

Estimated three-digit score and pass probability at each wrong-answer count for NBME 31 (CBSSA Form 31).

NBME 31 wrong answers to estimated score reference
WrongCorrect %Est. scorePass prob.
0100.0%27099%
597.5%26599%
1095.0%26099%
1592.5%25499%
2090.0%24999%
2587.5%24399%
3085.0%23899%
3582.5%23399%
4080.0%22799%
4577.5%22299%
5075.0%21697%
5572.5%21194%
6070.0%20686%
6567.5%20067%
7065.0%19546%
7562.5%18922%
8060.0%18410%
8557.5%1794%
9055.0%1732%
9552.5%1681%
10050.0%1621%
10547.5%1571%
11045.0%1521%
11542.5%1461%
12040.0%1411%
12537.5%1351%
13035.0%1301%
13532.5%1251%
14030.0%1191%
14527.5%1141%
15025.0%1081%
15522.5%1031%
16020.0%981%
16517.5%921%
17015.0%871%
17512.5%811%
18010.0%761%
1857.5%711%
1905.0%651%
1952.5%601%
2000.0%541%

Estimates only. Rows step by five wrong answers; your exact result is calculated above.

How the NBME 31 score calculator turns misses into a score

Two hundred items and a single line: the NBME 31 score calculator takes 1.08 per wrong answer off 270.48, then rounds.

Both constants are the lowest in the Step 1 set, so the NBME 31 score calculator draws a curve that is simultaneously flat and low.

Each question costs about 1.08 points, the gentlest per miss of the seven, yet the NBME 31 score calculator is still the least generous.

Pass probability comes from a separate logistic curve centred on 196. The NBME 31 score calculator reads 67 per cent at 65 wrong and 46 per cent at 70.

That transition is steep: 65 wrong reads 67 per cent in the NBME 31 score calculator, and 73 wrong reads 33 per cent.

There has never been a public CBSSA conversion table, so the NBME 31 score calculator reconstructs one; see the modelling notes.

On paper it is 1.08 times the wrong count, taken off 270.48 and rounded. No score report reaches the NBME 31 score calculator at all.

Checked by hand: the NBME 31 score calculator gives 233 at 35 wrong, 211 at 55 and 189 at 75.

NBME 31 score calculator chart, every count to a score

The figures below are produced by the NBME 31 score calculator itself, so nothing here can drift out of step.

At ten-question intervals the NBME 31 score calculator gives: 0 wrong 270 · 20 wrong 249 · 40 wrong 227 · 60 wrong 206 · 80 wrong 184.

The NBME 31 score calculator around the line, in fives: 50 wrong 216 · 60 wrong 206 · 65 wrong 200 · 69 wrong 196 · 70 wrong 195.

From percentages, the NBME 31 score calculator gives 249 for 90 per cent, 227 for 80 and 206 for 70.

The reference table higher up repeats those NBME 31 score calculator rows in five-question steps, each with a probability.

What a good Form 31 margin looks like this late

Against the 196 passing standard, the NBME 31 score calculator crosses at 69 wrong: 131 correct, or 65.5 per cent.

No sibling demands as few misses. Form 28 allows 75, six questions of slack the NBME 31 score calculator never gives you.

Above that, the NBME 31 score calculator puts 216 at 50 wrong, 227 at 40 and 238 at 30, which is 85 per cent correct.

A good NBME 31 score calculator result is a margin held on the strictest curve, which is the strongest form evidence this site offers.

How accurate the NBME 31 score calculator is, and the Free 120

Everything outside the raw count is invisible here. Sitting conditions, content sample and fatigue never reach the NBME 31 score calculator.

The Form 31 source table carries no interval either, so the NBME 31 score calculator shows a single number with nothing around it.

Agreement between two late instruments carries more weight than either alone, and disagreement is information as well, not a reason to pick the kinder number.

One caveat suits a recent form: less public experience exists to sanity-check the NBME 31 score calculator than for the older ones.

Accuracy claims need datasets. None exists publicly, so the NBME 31 score calculator makes none, and neither should anything quoting it.

Form 31 belongs in the last one to two weeks, where the NBME 31 score calculator is the final full-length checkpoint.

Its rival for that slot is the other final-fortnight instrument, which disagrees with the NBME 31 score calculator by construction.

The Free 120 moves 0.75 points per percentage point across 120 questions; the NBME 31 score calculator moves 2.16 across 200.

At 80 per cent correct they return 205 and 227. That 22-point gap describes the two instruments, not your preparation.

So do not average them. Read the Free 120 as a pass-or-not check and the NBME 31 score calculator as a positional estimate.

Raw counts do not travel either. Sixty wrong reads 206 in the NBME 31 score calculator and 210 on the form before this one.

Holding UWorld data too? Combine this with your UWSA results rather than picking whichever number you prefer.

Frequently asked questions

Straight answers about what this estimate can and cannot tell you.

How many wrong answers can I have on the NBME 31 score calculator?

Sixty-nine out of 200, which is 131 correct or 65.5 per cent. At 70 wrong the NBME 31 score calculator falls to 195.

That is the tightest tolerance of the seven forms here. The NBME 31 score calculator gives six fewer questions of slack than Form 28.

Why is my NBME 31 score calculator estimate lower than my other forms?

Because the conversion is lower everywhere. The NBME 31 score calculator starts at 270.48, the lowest ceiling here, and subtracts 1.08 per miss.

At any matched raw count the NBME 31 score calculator returns the smallest number of the seven — between one and nine points below its siblings.

Does NBME 31 or the Free 120 predict Step 1 better?

Neither, on any evidence this site holds. The Free 120 spans 145 to 220; the NBME 31 score calculator runs from 162 at a hundred misses up to 270.

The NBME 31 score calculator and the Free 120 return 227 and 205 at 80 per cent. Read them as two checks, not two estimates to average.

What percent correct does the NBME 31 score calculator need for 230?

About 81.5 per cent. Thirty-seven wrong gives 231 and 38 gives 229, so the NBME 31 score calculator skips 230 between adjacent counts.

For 216 the NBME 31 score calculator allows 50 wrong and for 238 it allows 30, since each miss costs about 1.08 points.

How late can I leave NBME 31 before my Step 1 exam?

In the final one to two weeks, timed and in one sitting so the NBME 31 score calculator stays comparable with earlier forms.

Sat that late, the NBME 31 score calculator gives the least flattering read available, which is the most useful evidence this close in.

Will the NBME 31 score calculator run on a wrong count alone?

Yes, the wrong count is the only input. Times 1.08, taken off 270.48 and rounded, and you have the NBME 31 score calculator result.

Subject breakdowns help you choose what to review, but play no part in the NBME 31 score calculator estimate.

Which NBME 31 score calculator row matches 75 per cent correct?

Two hundred and sixteen. Fifty wrong is 75 per cent, and the NBME 31 score calculator returns 216 with 97 per cent pass probability.

Move five points either way and the NBME 31 score calculator gives 227 at 80 per cent, 206 at 70 per cent.

Does an official NBME 31 score calculator exist?

No. Nobody publishes a CBSSA percent-to-score table, so an official NBME 31 score calculator does not exist, here or anywhere else.

What you get instead is the NBME 31 score calculator model in the open: both coefficients stated, assumptions linked. Not affiliated with the NBME® or USMLE®.

Cross-check this estimate against another form, or read how the models are built.

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Send it to a study partner sitting the same form, or print a copy once you have run your numbers.

Sixty-nine wrong is all Form 31 allows, and the NBME 31 score calculator needs no account.

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