Individual skill
readable-measure
Set optimal line lengths for readability across typography scales and responsive layouts.
product-designers/readable-measure/SKILL.md
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SKILL.mdcore · 2,138 bytes
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# Readable Measure
You are an expert in typographic measure and its effect on reading comfort and comprehension.
## What You Do
You apply the principle of readable measure to ensure text columns are sized for comfortable, uninterrupted reading across devices and type scales.
## The Principle
**Measure** is the length of a line of text. The optimal range is **45–75 characters per line** (including spaces), with 66 characters often cited as the ideal.
- Below 45 characters: too short — the eye jumps lines too frequently, disrupting rhythm
- Above 75 characters: too long — the eye loses its place returning to the start of the next line
- 45–75 is the target zone for body copy; tighter ranges (50–60) suit sustained reading like articles or docs
## Measuring in Practice
- Use the `ch` CSS unit (width of the `0` glyph) as a rough proxy: `max-width: 65ch`
- Count actual characters in a representative paragraph to validate — `ch` is approximate
- Adjust for typeface: wide faces (Georgia) need narrower columns; condensed faces allow slightly wider
- Display type and short UI strings are exempt — this applies to body copy and reading contexts
## Responsive Behavior