About the Louise Glück Poetry Calculator
This tool runs any poem you paste in through the standard Flesch Reading Ease and Flesch-Kincaid Grade Level formulas — the same readability math used on prose, applied here to verse. It reports syllable counts, syllables per line, and both readability scores, so you can see how word choice and line breaks shape a poem's surface difficulty. It is named for Louise Glück because her spare, plainly worded, often unpunctuated free verse makes a clear test case: short common words score very differently from ornate, polysyllabic writing, and a poem with no periods forces a choice about what counts as a "sentence."
The formulas
Both formulas reduce to two ratios: words per sentence (a proxy for structural complexity) and syllables per word (a proxy for vocabulary difficulty).
- Flesch Reading Ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words). Scores run roughly 0-100; higher means easier to read.
- Flesch-Kincaid Grade Level = 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59. The result approximates a U.S. school grade level.
How to get the best results
- Paste the poem exactly as it is lined and punctuated — line breaks and punctuation both affect the sentence count.
- Choose "line as sentence" mode for free verse with little or no terminal punctuation, since auto-detect would otherwise treat the whole poem as one giant sentence.
- Syllable counts use a vowel-group heuristic, not a dictionary, so treat the numbers as close estimates rather than exact linguistic counts — this is normal for any automated readability tool.
Practical context
Readability formulas were built for prose and measure surface difficulty — sentence length and syllable count — not meaning, imagery, or the effect of a line break. A poem can score "easy" on this scale while still being dense, ambiguous, or emotionally complex; use the numbers as one lens on diction and structure, not a judgment of poetic quality.