About the Readability Score Calculator
Readability formulas approximate difficulty from two things they can count: sentence length and word length. Flesch reading ease is 206.835 - 1.015 x (words per sentence) - 84.6 x (syllables per word) and returns a score out of 100, where 60 to 70 is plain English and anything under 30 reads like a legal contract. Flesch-Kincaid rearranges the same counts into a US school grade, so 8.2 means an average eighth grader should cope.
Paste a passage and the counts appear alongside the scores: sentences, words, syllables, words of three or more syllables, and the two ratios that drive every formula. The full detail view adds the Gunning fog index, the SMOG index, the automated readability index and the Coleman-Liau index, which weigh long words and letters slightly differently, plus an average of the grade scores. The longest sentence is quoted at the end because trimming that one sentence usually improves every score at once.
Treat the numbers as a rough guide rather than a verdict. Syllables are counted by a vowel group heuristic, which handles ordinary English well but stumbles on names, acronyms and unusual spellings. The formulas also know nothing about meaning: shuffled words score exactly the same as a coherent paragraph. Aim for around grade 8 for general audiences, lower for consumer instructions, and do not chase a target by chopping every sentence into fragments. For plain counting without the scoring, the Word Counter is enough.
How to use
- Paste at least a paragraph of text, since short samples give unstable scores.
- Press Score it to get the reading ease and grade level.
- Switch the detail option to Flesch only for a compact answer.
- Rewrite the longest sentence shown at the bottom, then score the passage again.
Common questions
- What is a good Flesch reading ease score?
- Sixty to seventy suits a general audience. News writing often lands near 60, while academic papers commonly fall below 30.
- How are syllables counted?
- By grouping consecutive vowels and adjusting for common silent endings. It is accurate for ordinary words but can miss on names and acronyms.
- Which formula should I trust?
- Compare several. Flesch-Kincaid is the most widely quoted, while SMOG is preferred for health material because it targets full comprehension.
- Does punctuation affect the result?
- Yes. Sentences are split on full stops, question marks and exclamation marks, so missing punctuation inflates the words per sentence figure.