The Leapfrog Group's Readability Calculator for Spanish Texts

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After selecting a file, the text from the Word document will populate in the text box in just a few moments. After the text loads in the text box, click "Calculate Readability"

Results

INFLESZ Readability Score

Interpretation

-- Words

-- Sentences

-- Phrases

-- Syllables

-- Words/Sentence

-- Words/Phrase

-- Syllables/Word

This calculator was developed using the INFLESZ Scale, developed and validated in 2008 by Barrio-Cantalejo et al, and now the most widely used in academic research on readability of Spanish-language consent forms (Aponte 2025). A free full text review of Spanish-language consent forms applying the formula is available here: https://www.mdpi.com/2039-4403/14/2/101 (Garcia-Alvarez 2024).

The INFLESZ scale is calculated as 206.835 − 62.35 × (total syllables/total words) − (total words/total sentences). A minimum threshold of 55 and above on the INFLESZ scale is considered to be readable by most patients.

Barrio-Cantalejo IM, Simón-Lorda P, Melguizo M, Escalona I, Marijuán MI, Hernando P. Validación de la Escala INFLESZ para evaluar la legibilidad de los textos dirigidos a pacientes [Validation of the INFLESZ scale to evaluate readability of texts aimed at the patient]. An Sist Sanit Navar. 2008;31(2):135-152. doi:10.4321/s1137-66272008000300004

Aponte J, Tejada K, Figueroa K. Readability Level of Spanish Language Online Health Information: A Systematic Review. Hisp Health Care Int. 2025;23(2):107-122. doi:10.1177/15404153241286720

García-Álvarez JM, García-Sánchez A. Nursing Roles in the Quality of Information in Informed Consent Forms of a Spanish County Hospital. Nursing Reports. 2024; 14(1):89-98. https://doi.org/10.3390/nursrep14010008

Bea-Muñoz M, Medina-Sánchez M, Flórez-García MT. Quality of websites with patient information about spinal cord injury in Spanish. Spinal Cord. 2016 Jul;54(7):540-5. doi: 10.1038/sc.2015.190. Epub 2015 Oct 20. PMID: 26481713.