UWSA 1 to Step 2 CK Score Conversion
Enter your Step 2 CK UWSA 1 score for an estimated three-digit score and range. For example, a UWSA 1 of 250 maps to about 245 in this model.
Convert UWSA 1 to Step 2 CK
Keep Step 2 CK selected and enter your UWSA 1 score. Add a later CCSSA, UWSA 2, or Free 120 to see whether your preparation has moved since the baseline.
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UWSA 1 to Step 2 CK conversion chart
Midpoints from the same model the calculator uses, with the 2026 USMLE percentile of each estimate. The calculator adds a range around every midpoint.
| UWSA 1 score | Estimated Step 2 CK | 2026 percentile |
|---|---|---|
| 200 | 195 | <1st |
| 210 | 205 | <1st |
| 220 | 215 | 2nd |
| 230 | 225 | 6th |
| 240 | 235 | 15th |
| 245 | 240 | 23rd |
| 250 | 245 | 32nd |
| 255 | 250 | 44th |
| 260 | 255 | 58th |
| 265 | 260 | 71st |
| 270 | 265 | 83rd |
| 280 | 275 | 98th |
Percentiles come from the official 2026 Step 2 CK percentile table. The adjustments are explained in the methodology.
How to use a UWSA 1 result
Read it as a baseline. UWSA 1 is often taken weeks before the exam. A gap between UWSA 1 and a later assessment usually says more about learning since then than about either test.
Compare like with like. Put UWSA 1 next to UWSA 2, a CCSSA, or Free 120 in the calculator instead of averaging raw numbers yourself; each source gets its own adjustment and weight.
Look at the range, not only the midpoint. The Step 2 CK passing score is 218. If the lower end of your range is near it, plan another checkpoint before committing to a date.
UWSA 1 Step 2 CK FAQs
Is UWSA 1 accurate for Step 2 CK?+
NBMEcalc does not publish a verified UWSA 1 error rate. UWSA 1 is usually taken earlier in preparation, so it reflects where you were at that point. Treat it as a baseline and confirm with a later CCSSA, UWSA 2, or Free 120.
Why does the calculator subtract 5 points from UWSA 1?+
The model applies a disclosed −5 adjustment to UWSA 1 before aggregation (−2 for UWSA 2). It is an internal modelling assumption based on the common observation that UWorld self-assessments read higher than the real exam, not an official UWorld or USMLE offset.
What UWSA 1 score do I need for a 250 on Step 2 CK?+
There is no official one-to-one conversion. In this model a UWSA 1 of 255 maps to about 250. A single early UWSA 1 should not set a target by itself.
Is this the same as UWSA 1 for Step 1?+
No. UWorld sells separate self-assessments for Step 1 and Step 2 CK. This page is for the Step 2 CK UWSA 1. For the Step 1 version, use the UWSA 1 to Step 1 page.
Should I take UWSA 1 or an NBME first?+
Many students use UWSA 1 as an early baseline and save CCSSA forms and Free 120 for later checks, but there is no required order. What matters most is having more than one recent assessment before choosing a test date.