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148:, but for continuous text lines with more than 80 characters may be too long. Short text, such as ragged marginal notes, may be as little as 12–15 characters per line. Studies have shown that short lines are often preferred over long lines by study participants, likely because they feel more at ease with format, which contradicts research suggesting longer lines are best for quick reading.
124:(cpl), though the ideal is 66 cpl (including letters and spaces). For conventional books line lengths tend to be 30 times the size of the type, but between 20 and 40 times is considered acceptable (i.e., 30 × 10pt font = 300 pt line). Early studies considered line lengths of 59–97 mm (about 57 cpl) optimum for 10-point font. For printed works with multiple
274:. The matrix is used by locating the number closest to the previously calculated LCA on the left column of the matrix and then scanning across the columns the number of characters that one would like to set in the text line. Once the number is located, the top row of the selected column will indicate the ideal line length.
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calculation. Given that the lowercase alphabet has 26 characters, multiplying LCA by 1.75 roughly yields the optimal number of characters for novice readers (26 × 1.75 = 45.5 ). Multiplying the optimal number of character by 0.75 yields the minimum number of characters for novice readers (45.5 × 0.75
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Subjective factors also play a role in line length selection for digital text. One study has found that CPL had only small effects on readability, including factors of speed and comprehension; but when asked for preferences, 60% of respondents indicated a preference for either the shortest (35 CPL)
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Researchers have suggested that longer lines are better for quick scanning, while shorter lines are better for accuracy. Longer lines would then be better suited for cases when the information will likely be scanned, while shorter lines would be appropriate when the information is meant to be read
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There are a few methods to calculate line length to fit the intended average count of characters that such lines should contain based on the factors listed above. Most, if not all, of these methods use the length of the lowercase alphabet (LCA) as a reference for its calculation. The lowercase
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thoroughly. One proposal advanced that, in order for on-screen text to have the best compromise between reading speed and comprehension, about 55 cpl should be used. On the other hand, there have been studies indicating that digital text at 100 cpl can be read faster than text with lines of 25
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The experience of the reader can also be considered as a factor when determining the count of characters within text lines. For novice readers, text lines should contain between 34 and 60 characters, 45 being the optimal number. Texts for expert readers could contain between 45 and 80
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Screen reading poses additional challenges, making the adoption of traditional line length research to the digital format problematic. Unlike printed text, writing for digital media must accommodate factors such as glare, flicker, and scrolling/paging.
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where all lines are of equal length. In a ragged right setting, line lengths vary to create a ragged right edge. Sometimes this can be visually satisfying. For justified and ragged right settings typographers can adjust line length to avoid unwanted
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Legibility research specific to digital text has shown that, like with printed text, line length can affect reading speed. If lines are too long it is difficult for the reader to quickly return to the start of the next line
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has a maximum line length that fits a determined design. If the lines are too short then the text becomes disjointed; if they are too long, the content loses rhythm as the reader searches for the start of each line.
253:) was sometimes included in type specimen booklets. If not available, the first step to calculate the line length for all these methods is the measurement of the LCA at the size that will be ultimately used.
289:= Ll) that consists of multiplying a modified version of LCA (the lowercase alphabet plus a space character ) by the desired number of characters (Cρ) multiplied by a constant of 0.0345 (S).
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Ling, J., & Van Schaik, P. (2006). The influence of font type and line length on visual search and information retrieval in web pages. International
Journal of Human-Computer Studies, 64(5), 395-404.
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Dyson, M. C., & Haselgrove, M. (2001). The influence of reading speed and line length on the effectiveness of reading from screen. International
Journal of Human-Computer Studies, 54(4), 585-612.
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Traditional line length research, limited to print-based text, gave a variety of results, but generally for printed text it is widely accepted that line lengths fall between 45 and 75
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Tinker, M. A., & Paterson, D. G. (1929). Studies of typographical factors influencing speed of reading. III. Length of line. Journal of
Applied Psychology, 13(3), 205-219.
451:
Dyson, M. C., & Kipping, G. J. (1998). The
Effects of Line Length and Method of Movement on Patterns of Reading from Screen. Visible Language, 32(2), 150-181.
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or longest (95 CPL) lines used in the study. At the same time, 100% of respondents selected either one of these quantities as being the least desirable.
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of a text should be increased—if the measure is short, it can safely be decreased. Reverse text, i.e. white text on black, also requires more leading.
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282:= 34.125 ), while multiplying this same number by 1.5 roughly yields the maximum number of characters for novice readers (45.5 × 1.5 = 68.25 ).
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Nanavati, A. A., & Bias, R. G. (2005). Optimal line length in reading - a literature review. Visible
Language, 29(2), 121-145.
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fixes the measure to about 66 characters per line regardless of the text size as the ch unit is defined as the width of the glyph
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Bringhurst, R. (1992). Horizontal Motion. The
Elements of Typographic Style, pp 25-36. Point Roberts, WA: Hartley & Marks.
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with several goals in mind: balance and function for fit and readability with a sensitivity to aesthetic style in typography.
236:(1953). The lowercase alphabet measurement for each of the sizes displayed on this page can be found on the left column.
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192:(zero, the Unicode character U+0030) in the element's font. For user agents that do not support the ch unit a value of
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per line is 40; anything less than 38–40 characters often results in splotches of white spaces (or rivers) or too many
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adjust line length to aid legibility or copy fit. Text can be flush left and
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The second method consists of a formula that uses the LCA as a unit in a
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420:(4a ed., corr. y aum ed.). Somonte-Cenero, Gijón: Ediciones Trea.
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Line length is determined by typographic parameters based on a formal
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words/characters at the end of lines (e.g., "The", "I", "He", "We").
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537:(4th ed. (version 4.0) ed.). Seattle, WA: Hartley & Marks.
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is the number of characters per line in a column of text. Using
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505:"The Effects of Line Length on Reading Online News"
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285:The third known method is also a formula (LCA’ × C
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16:In typography, width of a block of typeset text
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358:6 February
293:References
214:characters
134:characters
28:typography
21:Arc length
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436:880551642
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130:justified
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476:8 August
383:8 August
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