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Paste text → Flesch-Kincaid grade level + reading ease score for students & educators
The Reading Level Calculator uses the Flesch-Kincaid formulas to analyze pasted text and return a US grade level equivalent and reading ease score. It counts words, sentences, and syllables to evaluate text complexity — useful for students, teachers, and writers.
Frequently Asked Questions
Sobre Esta Calculadora
The Flesch-Kincaid readability formulas were developed in the 1970s for the US Navy to evaluate the clarity of training manuals. They've since become the standard readability metric in education, publishing, and government writing guidelines. Two outputs matter: the Grade Level (what US grade a reader needs to understand the text) and Reading Ease (a 0–100 score where higher means easier to read).
Both metrics respond to the same two variables: average sentence length and average syllable count per word. Writing shorter sentences and preferring simpler words directly lowers the grade level and raises the reading ease score. Passive voice, nominalization, and jargon all tend to inflate grade level.
Educators use this tool to evaluate whether assigned texts match students' reading levels. Students use it to check whether their essays are clear and appropriately pitched. Writers targeting a general audience use it to avoid unnecessarily complex language.
Aplica fórmulas para ver a dificuldade.
Fórmula
FK Grade Level = 0.39×(Words/Sentences) + 11.8×(Syllables/Words) − 15.59 Reading Ease = 206.835 − 1.015×(W/S) − 84.6×(Syl/W)
Exemplo Resolvido
Analyzing the readability of a college essay draft
Entradas:
- Word count: 650 words
- Sentence count: 42 sentences
- Syllable count: 910 syllables
Passo a Passo:
- Words per sentence = 650 / 42 = 15.5
- Syllables per word = 910 / 650 = 1.40
- FK Grade Level = 0.39×15.5 + 11.8×1.40 − 15.59 = 6.05 + 16.52 − 15.59 = 6.98 ≈ Grade 7
- Reading Ease = 206.835 − 1.015×15.5 − 84.6×1.40 = 206.835 − 15.73 − 118.44 = 72.7
Dicas
- A Flesch Reading Ease of 60–70 is ideal for most general audiences — newspapers target this range.
- Grade level 8–9 is the sweet spot for widely-read non-fiction and clear academic writing.
- Very long sentences and multi-syllable words are the primary drivers of high grade level.