Free 120 Step 2 Score Conversion Calculator
Enter your Free 120 percentage to get an independent Step 2 CK estimate and planning range. Use it with a recent CCSSA or UWSA rather than as a guaranteed one-to-one conversion.
Convert Free 120 percent to a Step 2 CK estimate
Pick your Step exam, then choose Free 120 as the source and enter your percentage correct.
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Free 120 score conversion: the quick answer
A Free 120 score conversion is a planning estimate from percent correct to a Step score range. It should answer one question: does your official-style sample exam agree with the rest of your practice data?
For Step 2 CK, use the current official sample questions for the cleanest late-stage signal. The 2019 and 2021 sets remain useful practice, but their percentages are not interchangeable with the current set.
For a multi-exam forecast, add your percentage to the free NBME score calculator alongside a recent CCSSA or UWSA instead of treating Free 120 as a standalone prediction.
- Use your raw percent correct, not a rounded block average if you have the total.
- Enter Free 120 as one input in the calculator, then add a recent CCSSA or UWSA.
- Compare the midpoint with the estimated range before changing your test date.
- If Free 120 and your latest NBME disagree by more than 8-10 points, trust the range and investigate why.
Current vs 2021 vs 2019 Free 120
These year labels are informal names students use for different official question sets. USMLE presents the latest material as its current sample test rather than publishing an official conversion curve for each year.
Version matters because identical percentages from different item sets are not interchangeable. The calculator on this page is intended for the current official material; treat an estimate from an older set as rough context only.
| Version | What it represents | How to use it |
|---|---|---|
Current official material Recommended | The sample questions and interactive testing experience currently linked by USMLE. The items were refreshed in 2023, and the testing interface was updated for Step 2 CK in May 2026. | Use this set for your primary late-stage check. Enter its raw percent correct in the calculator and compare the result with a recent CCSSA or UWSA. |
2021 Free 120 Archived set | An older official booklet containing 120 questions. It predates the 2023 sample-item refresh and the 2026 testing-interface update. | Use it for additional official-style practice or historical comparison. Do not assume the same percentage has the same meaning as on the current set. |
2019 Free 120 Legacy set | The oldest commonly referenced set. It predates the November 2020 Step 2 CK content-distribution change affecting systems-based practice, patient safety, ethics, and professionalism. | Use it as older official-style practice, not a current score forecast. Its content distribution is the least current of these three sets. |
Free 120 % → Step 2 CK conversion
Independent estimate—not an official NBME or USMLE conversion.
| Free 120 % | Internal model midpoint |
|---|---|
| 50% | 217 |
| 60% | 228 |
| 65% | 234 |
| 70% | 240 |
| 75% | 246 |
| 80% | 252 |
| 85% | 257 |
| 90% | 262 |
| 95% | 268 |
* This is the calculator's illustrative internal scale, not an official conversion curve or a validated probability table. Use the displayed planning range and a recent comprehensive assessment.
How to use Free 120 in a score forecast
- Take the version that matches the Step exam you are preparing for
- Use percent correct as one input, not a guaranteed final score
- Compare it with a recent comprehensive NBME self-assessment
- Investigate large disagreements between recent practice results
- Plan from the estimated range rather than the midpoint alone
Related score conversion tools
Free 120 is strongest when it agrees with another recent input. Use these pages to check whether your forecast is internally consistent.
Free 120 FAQs
What is the Free 120 score converter for Step 2?+
It is an independent calculator that turns your Free 120 percent correct into a Step 2 CK planning estimate. It is not an official USMLE or NBME conversion table, so use the estimate together with a recent comprehensive self-assessment.
How predictive is Free 120 for Step 2 CK?+
Free 120 is a useful late-stage readiness signal because its format and content outline resemble the live exam. It is still one assessment, so combine it with a recent CCSSA or UWSA and use the full predicted range.
How should I interpret Free 120?+
Its main value is familiarity with official-style questions and timing close to test day. There is no official one-to-one percentage-to-score conversion, so the table below is an independent estimate rather than an NBME or USMLE score report.
When should I take Free 120?+
Most students get the cleanest planning signal inside the final 1-2 weeks. Earlier can still be useful for pacing practice, but the score becomes less tied to test-day readiness as more study time remains.
What Free 120 percentage equals a 250 Step 2 CK?+
Approximately 78-80% on Free 120 corresponds to a Step 2 CK around 250.
Does Free 120 also predict Step 1?+
Yes for Step 1 candidates — there is a separate Step 1 Free 120. Use the Step 1 selector in the calculator below.
What is the difference between the current, 2021, and 2019 Free 120?+
The current official material is the best match for today's Step 2 CK format. The 2021 set is an older 120-question booklet, while the 2019 set predates the November 2020 content-distribution change that increased systems-based practice, patient safety, legal/ethical issues, and professionalism. Use older sets for extra practice, not as interchangeable score predictors.