Ever wondered why some texts are a breeze to read? The secret lies in text readability—the ease with which readers can understand and process written content. The way to find out your text's readability is to use readability formulas: algorithms that measure a text's ease of understanding. These formulas, specific to each language, were developed by linguists, scientists, educators, and psychologists. In Spanish, such experts have developed several formulas to check readability. The results inform you who your target readers are: their grade level, reading difficulty, age, etc. And they can help you decide if you need to further edit your text to engage your readers.

With a click of the button, you can score your text with:
The Fernández Huerta Index: a readability formula developed by José Fernández Huerta for scoring Spanish texts. This formula tells you if readers can understand your text upon first reading.
The Szigriszt-Pazos Perspicuity Index: a readability formula developed by Isabel Szigriszt and Francisco Pazos. This formula, like the Fernández Huerta Index, is for the Spanish language. It's part of the broader consensus to create tools and metrics that can assess the readability and clarity of texts in languages other than English.
The Inflesz Scale: a revised reading scale for the Szigriszt-Pazos formula, providing a more accurate way to interpret the results. The Inflesz scale categorizes the text into different reading difficulty levels.
Gutiérrez de Polini's Readability Formula: the first readability tool specifically for the Spanish language. Luisa Elena created it in 1972 to align closely with the syntactic, morphological, and lexical features of the language.
Readability μ Formula: Miguel Muñoz Baquedano and José Muñoz Urra developed this formula to measure how easily people can read a text. This formula analyzes the number of words, the average letters per word, and the variation in the number of letters across words.
Spanish SMOG Formula (SOL): adapts the English-language SMOG (Simple Measure of Gobbledygook) formula for use with Spanish texts. SMOG will let you know how easy it is to read and understand your text.
Flesch-Kincaid Grade Level (SOL): a popular readability formula originally developed for English texts and adapted to Spanish using a SOL (Spanish Orthographic Length) measurement. It's designed to indicate the grade level of education required to understand your text.
Spaulding Readability Formula: adapted for the Spanish language as the "Índice de Perspicuidad de Spaulding," it analyzes the linguistics of Spanish words and determines how easy or difficult readers will find your text.
Crawford's Readability Score: calculates the Spanish grade level needed to understand your text. It was developed by Alan N. Crawford in 1989. The formula helps guide material selection for different educational stages.
García López Readability Formula: Introduced by José Antonio García López, this formula is a Spanish adaptation of the English-language Flesch Readability Formula. It calculates the age needed to read and understand your text upon first reading.
Spanish Fry Graph: adapted from the original Fry Graph (for English-language) to score the readability of Spanish texts. Linguists Gilliam, Peña & Moutain adjusted the syntactic differences between English and Spanish, especially in syllable count and length. The formula is validated to output predictable grade levels for Spanish texts.

We also give you the Average Readability Score, a consensus of your text's readability from 10 formulas.

Readability formulas won't tell you how to make your text resonate with your readers: how to connect with their experiences, interests, and aspirations. Or when to use special formatting, typography, or images. But they will help you tailor your writing to meet their specific reading abilities. For example, when writing for young readers, the language needs to match their cognitive development stage, ensuring it's neither too difficult nor too easy. In contrast, texts for academic experts use complex language and specialized terms. The aim here is to convey detailed information and in-depth analysis.

Readable content is important in today's fast-paced, information-dense world. Readers prefer to scan text or glean information quickly. Clear, concise, accessible text is what engages them. Use readability formulas to achieve this goal.

(If you need to score English text, use the Readability Scoring System)