Optimal Line Length: Research Supporting How Line Length Affects Usability
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Bailey, Robert
Web Usability
2002

Abstract:

What is the optimal line length when reading prose text from a monitor? Certain aspects of usability have been researched for over 120 years. One active area of investigation has been the influence of line length on the speed of reading prose text. Weber (1881) made the first research-based recommendations when he suggested that an ideal line length was 4 inches (100 millimeters). He stated further that the maximum never should exceed 6 inches (150 mm). The same year Javel (1881) reported that line lengths should be no longer than 3.6 inches (90 mm). Two years later, Cohn (1883) confirmed that 3.6 inches (90 mm) was the best length, and that 4 inches (102 mm) was the longest admissible line length.