Flesch Reading Ease PT

The Flesch reading ease index measures how demanding a text is from two things you can count: the average sentence length and the average number of syllables per word. Long sentences tire, long words demand more. The original formula was calibrated for English, and applying it straight to Portuguese gives a misleadingly low score — Portuguese words simply carry more syllables.

This page uses the Portuguese adaptation, with constants recalibrated for that syllabic average. The scale reads as usual: above 70, easy text of the kind you read without effort; between 50 and 70, medium, suitable for a general audience; below 50, difficult, demanding specific background or a second reading. Paste the text and the index comes out with its classification.

Syllable counting works by vowel groups, which is an approximation: it gets most words right and misses on hiatus, where consecutive vowels form separate syllables, and on unusually spelled diphthongs. For comparing two versions of the same text, the deviation cancels out and the index is useful. Treating the number as an absolute measure deserves scepticism — no formula of this kind judges whether the text makes sense.