Character · Sherlock
Sherlock Holmes's IQ, and what Sherlock's IQ Score actually reveals.
How smart is Sherlock Holmes? Smart enough that "Sherlock Holmes's IQ" is one of the most searched questions about Sherlock. Here is the defensible read of the mind the show actually builds, the 148/200 IQ Score behind it, and why no invented number does it justice.
The answer
Sherlock Holmes anchors Sherlock as one of its central intelligences, and the show earns a 148/200 IQ Score (Stimulating tier) for how seriously it builds that mind. That score is the real, measurable answer the search is circling. The specific IQ figures floating around online are invented; no clinical IQ test applies to a fictional character, and TVI does not fabricate one. We rate the work, not the character, on a published 0 to 200 rubric.
Who Sherlock Holmes is, and what kind of intelligence the show actually depicts
Sherlock Holmes (Benedict Cumberbatch) is consulting detective whose famous deductive method is the explicit subject of the show. The character's intellectual signature in the show is visual-deductive reasoning, encyclopedic recall, social cognition rendered as a weakness rather than the gift his intellect is.
This is the part of the question "what is Sherlock Holmes's IQ" that the search engine flattens. The real question, the one viewers are circling, is whether the show treats Sherlock Holmes's mind seriously. That's the question TVI can actually answer.
What the IQ Score reveals about the portrayal
Sherlock scores 148/200 (Stimulating tier), not Masterclass, because while the show foregrounds intelligence as content, its treatment of that intelligence sometimes prioritizes spectacle over rigor. The visual-deduction sequences are formal innovations; the underlying mysteries don't always reward the close attention they demand. The IQ Score reflects this: high cognitive demand, real craft, but uneven analytical follow-through.
For the full score breakdown, Cognitive Stimulation, Educational Value, Craft & Quality, and the rationale, see Sherlock on TV Intelligentsia. Or read what an IQ Score is and how it's calculated.
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