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A diagnostic LSAT is the first full practice test you take before studying, and it sets your baseline. Average cold diagnostic scores typically fall in the mid-to-high 140s to low 150s for most first-timers 120 to 180. The 120 to 180 scale leaves most beginners real room to improve.
By Ali Unar, JD candidate at Georgetown Law and founder of Lovare Institut. Last updated August 2026. Figures on this page were verified in August 2026 or point readers to the current source.
A diagnostic LSAT is the first full-length practice test you take before any real studying, and its purpose is to set an honest baseline. The score tells you how far you sit from your target on the 120 to 180 scale and how much preparation you will need. Nearly everyone improves substantially from their diagnostic with structured study see the linked source (see the linked source).
Average cold diagnostic scores typically land below the eventual official average, in the mid-to-high 140s to low 150s for most first-timers 120 to 180. A diagnostic in that range is normal and does not cap your potential, because the diagnostic measures untrained reasoning rather than your ceiling on the 120 to 180 scale.
Use your diagnostic score to plan, not to judge yourself. Compare it to the medians of your target schools to size the gap, then build a study timeline around that distance your target schools' published 25th-50th-75th percentile figures. Retake a full practice test every few weeks to measure progress against your original diagnostic baseline.
A good LSAT score is one at or above the median of your target schools rather than a single national number. Scores above the low-150s average are competitive for many programs, and the most selective schools expect high 160s to 170s each school's median LSAT (see its 509 report). Your diagnostic simply shows the starting distance.
The average official LSAT score sits in the low 150s on the 120 to 180 scale the low-to-mid 150s (LSAC publishes no single headline average; the median sits near 152). Diagnostic averages tend to fall below this, since a diagnostic is taken cold, so improving from your diagnostic toward and past the average is the normal arc of preparation.
The LSAT is scored by counting correct answers into a raw score, then converting that raw score to a 120 to 180 scaled score using a per-form equating curve. Wrong answers are not penalized. Your diagnostic uses the same conversion, so a practice raw score maps onto the same 120 to 180 scale as the official test.
Verified August 2026.
August 21, 2026
August 21, 2026