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Free screen reader line length calculator. Get ideal characters per line, words per line, efficiency score, and Optimal / Borderline / Too Long status. Pair with cognitive load for complex pages.
Last updated: May 24, 2026
Visual line length for sighted users? Font size accessibility calculator
Estimated Words per Line
12.2
Readability Efficiency Score
83/100
Line Length Status
Optimal
Current line length is likely manageable for screen-reader rhythm and comprehension.
Planning aid only. Validate final content with real screen-reader testing and user feedback.
We can build and embed a custom version of Screen Reader Line Length Calculator for your brand and workflow.
Answers: how long should lines be for NVDA/JAWS and is my paragraph too dense when read aloud.
chars ÷ (avg word length + 1) — default 12.2 words.
Prose 65 · instructional 60 · technical 58 · legal 55 characters.
Length + punctuation + complexity → Optimal / Borderline / Too Long.
Default: 78 chars/line · 5.4 char/word · 9% punctuation · prose → ideal 65 chars · 12.2 words/line · penalties 11.7+1.3+4 → score 83/100 · Optimal.
Words / Line
12.2
Efficiency Score
83/100
Status
Optimal
| Content type | Ideal length | Complexity penalty |
|---|---|---|
| General prose | 65 characters | +4 pts |
| Instructional | 60 characters | +4 pts |
| Technical docs | 58 characters | +7 pts |
| Legal / policy | 55 characters | +10 pts |
| Component | Formula | Default example |
|---|---|---|
| Length | |chars − ideal| × 0.9 | 78 vs 65 ideal → 11.7 pts |
| Punctuation | max(0, (density% − 8) × 1.3) | 9% → 1.3 pts |
| Complexity | prose/instructional 4 · technical 7 · legal 10 | Prose → 4 pts |
| Score | Status | Meaning |
|---|---|---|
| 78–100 | Optimal | Line structure likely supports smoother readout |
| 58–77 | Borderline | Tune length and punctuation |
| 0–57 | Too Long | Shorten lines and simplify sentences |
Auditory ergonomics heuristic — validate with real assistive technology sessions.
wordsPerLine = lineChars ÷ (avgWordChars + 1)score = 100 − |chars−ideal|×0.9 − max(0,(punct%−8)×1.3) − complexityPtsstatus = score≥78 Optimal · ≥58 Borderline · else Too Long12.2 words/line · score 83 · Optimal (+13 chars vs ideal).
10.8 words/line · score 96 · Optimal.
12 words/line · score 59 · Borderline — shorten toward 55-char ideal and cut punctuation.
14.3 words/line · score 40 · Too Long.
10 words/line · score 96 · Optimal.
10.8 words/line · score 80 · Optimal.
Share with content designers, accessibility reviewers, and policy teams publishing long-form text.
Suggested hashtags: #ScreenReader #Accessibility #ContentDesign #WCAG #InclusiveDesign