Flesch Reading Ease with the working shown

Between 60 and 70 for writing aimed at a general adult audience — Flesch labelled that band Standard, and it corresponds to 8th to 9th grade schooling. Marketing copy and popular journalism often sit in the 70s; a broadsheet feature is comfortable in the 50s; anything below 30 is specialist prose that a general reader will have to work at. Aiming for 90 is not a virtue: writing that scores that high is usually written for children, and adult readers find it patronising rather than clear.

Yes, both — the scale is a name rather than a range. The theoretical maximum for English is 121.22, reached by a one-word sentence made of a single-syllable word, and short simple text routinely scores above 100 in practice. There is no floor at all: a long sentence packed with polysyllables can drive the number well below zero, and dense legal or academic prose sometimes does. Some implementations, including the one in Microsoft Word, clamp the result at 100 and at 0, which is why an unusually easy passage can look identical to another when it is not.

Because the two disagree about counting, not about the formula. Word applies its own syllable estimation and its own rules on what constitutes a sentence, and it clamps the output at 100. The most common source of divergence is structural: Word includes headings, list items and table cells in the count, and a bulleted list with no full stops is read there as one very long sentence. Score the running prose on its own in both places and the two land within a point or two of each other.

By estimation, not by dictionary lookup — vowel groups counted, then corrected for silent final e, sounded -ed and -es, consonant plus -le, the -tion family and a short list of irregular words. On a held-out sample of 198 everyday words that agrees with the dictionary about 95 per cent of the time. The misses are compounds like homework, whose internal silent e cannot be seen from the spelling, and borrowings like recipe that sound a final e. No estimator does better than the low nineties without a full pronunciation dictionary, and the residual error moves a whole document's score by a fraction of a point.

No. They share an author's name, two inputs and nothing else. Reading Ease produces a number from roughly 0 to 100 where higher means easier; Flesch-Kincaid produces a US school grade where higher means harder, so the two move in opposite directions. They also use different coefficients, which is why you cannot convert one to the other with a formula, only approximate it. Flesch published Reading Ease in 1948; the grade-level version came out of a US Navy project with J. Peter Kincaid in 1975 to specify the reading level of technical manuals for enlisted personnel.

No, and the number it produces for other languages is worse than useless because it looks plausible. The constants 206.835, 1.015 and 84.6 were fitted to English reading-test data, and the relationship between syllable count and difficulty is different in every language — German compounds and Finnish inflection wreck it, Spanish words average more syllables without being harder. Adapted versions with refitted constants exist for several languages, including Fernández Huerta's for Spanish and Amstad's for German, and those are what you want rather than this one.

Several US states do, for consumer contracts. Florida requires most insurance policies to score at least 45 on Flesch Reading Ease, and comparable plain-language statutes elsewhere set their own floors for policies and consumer agreements. That is unusual: almost everywhere else the score is a guideline rather than a requirement. It does mean the formula occasionally has to be computed exactly rather than approximately, which is why the working is printed above instead of just the answer.