Shannon's 1950 Hand-Calculated English Entropy: 80% First-Guess Accuracy with 100-Letter Context

alexbilz · x · 2026-08-06

Recalling Claude Shannon's classic 1950 experiment to measure the entropy of the English language. His wife served as the subject, guessing a Jefferson biography text letter by letter. With 100 letters of context, her first guess was accurate 80% of the time. From this, Shannon bounded the entropy of English between 0.6 and 1.3 bits per letter, concluding that the language is roughly 75% redundant.

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