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. 2021 Mar 24;19:106. doi: 10.1186/s12955-021-01738-4

Equation 1.

Formulae for computing the Flesch-Reading-Ease-Score for the English [33] and the German FROM-16 [34]

ENGLISH:
FRE = 206.835 − 84.6 * WL − 1.015 * SL
GERMAN:
FRE = 180 − SL − WL * 58.5
WL = average word length in syllables
(= number of syllables divided by number of words)
SL = average sentence length
(= number of words divided by number of sentences)