The Science of Readability: Why Line Length Matters
Elena Vance
Content Specialist
Readability is not just about font choice; it's about the physical structure of your text. One of the most overlooked aspects of web design is line length, technically known as "measure."
What is the Optimal Measure?
Research suggests that the ideal line length for body text is between 50 and 75 characters per line, including spaces. Anything shorter breaks the reader's rhythm as their eyes have to travel back and forth too frequently. Anything longer makes it difficult for the eye to find the beginning of the next line.
Why Does It Matter?
When lines are too long, the reader's eyes have a hard time focusing. This leads to subconscious fatigue. By maintaining a comfortable measure, you allow the reader to absorb information more efficiently.
How to Implement This
In web design, you can control this using CSS max-width properties on your text containers. A common practice is setting a max-width of around 65ch (65 characters).
✓Key Takeaways
- 1
Aim for 50-75 characters per line.
- 2
Use max-width: 65ch in your CSS.
- 3
Shorter lines increase reading speed but can feel choppy.
- 4
Longer lines cause eye fatigue.