Reading Grade Level (Flesch-Kincaid)
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The Flesch-Kincaid Grade Level formula estimates the US school grade required to understand a text. The companion Reading Ease score (0–100) measures readability — higher scores mean easier reading.
- 1FK Grade Level = 0.39 × (words/sentences) + 11.8 × (syllables/words) − 15.59
- 2FK Reading Ease = 206.835 − 1.015 × (words/sentences) − 84.6 × (syllables/words)
- 3Shorter sentences and simpler words both improve readability
- 4Syllables counted by detecting vowel groups in each word
Simple children's book text=Grade 2–4, Reading Ease 80–90
Typical newspaper article=Grade 6–8, Reading Ease 60–70
Academic journal abstract=Grade 12–16, Reading Ease 20–40
| Reading Ease | Grade Level | Description |
|---|---|---|
| 90–100 | Grade 5 | Very Easy — comic books |
| 80–90 | Grade 6 | Easy — conversational English |
| 70–80 | Grade 7 | Fairly Easy |
| 60–70 | Grades 8–9 | Standard — newspapers |
| 50–60 | Grades 10–12 | Fairly Difficult |
| 30–50 | College | Difficult — academic |
| 0–30 | Professional | Very Difficult — legal and medical |
References
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