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LIX Readability Calculator

LIX measures readability using sentence length and proportion of long words (>6 letters). Works for many European languages.

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LIX (Läsbarhetsindex) is a Swedish readability index created by Carl-Hugo Björnsson in 1968.

It combines average sentence length with the percentage of "long" words — words with more than 6 letters.

It generalises better to many European languages than the Flesch-family formulas, which are tuned for English.

(\frac{w or d s}{se n t e n ces}) + (\frac{l o n g W or d s \cdot 100}{w or d s})

What languages does LIX support?

LIX was designed for Swedish but works reasonably for Germanic and Romance languages: English, German, Dutch, Spanish, French, Italian, Portuguese.

What counts as a "long" word?

In LIX, any word longer than 6 characters.

Classic 0–100 readability score.

U.S. grade level for your text.

Penalises complex (3+ syllable) words.

Health & medical text grade level.