What is the ideal length of a line of type to ensure readability?

The ideal length of a line of type for ensuring readability is typically considered to be 40 to 50 characters per line. This range strikes a balance between preventing both overcrowding and excessive white space, making it easier for readers to track from the end of one line to the beginning of the next without losing their place.

Lines that are too short may force readers to jump down too frequently, which can disrupt their flow and comprehension. Conversely, lines that are excessively long can lead to fatigue, as readers have to scan wider distances to follow text. Therefore, the selected range of 40 to 50 characters is generally accepted as optimal, promoting a smoother reading experience and facilitating better retention of the information.