04/21/2026
How many spaces should be used after a period at the end of an English sentence is still a topic that can infuriate people, James Hamblin wrote in 2018.
That’s when a study was published that specifically considered the question. “Our data suggest that all readers benefit from having two spaces after periods,” Rebecca Johnson, the study’s head researcher, told Hamblin. Among people in the study who use two spaces after a period, there was a 3 percent increase in reading speed when reading text with two spaces following periods—an average of nine additional words a minute. “Removing the spaces between words altogether drastically hurts our ability to read fluently, and increasing the amount of space between words helps us process the text,” Johnson told Hamblin.
But the scientifically optimal number of spaces hasn’t been well studied, and the 2018 study, which consisted of only 60 subjects, was far from definitive. “Most importantly, the effects appeared early in processing, and spacing did not affect overall comprehension,” Hamblin continued. “And that’s what reading is all about, no? The fact that our eyes may move a little faster is less important than whether the concepts make it into our brains … Even in the studies where researchers have removed interword spaces altogether, reading comprehension is still very high. For example, Thai and Chinese are typically written without spaces between words, even though studies have found that when space is added between words, reading speed increases.”
“The standard comes down to aesthetics, tradition, conservation of paper and space—basically, the fact that reading is an act of much more than information delivery,” Hamblin continued at the link in our bio. For instance, “it goes against the findings of science that our words should be in a single color, usually black and usually on a near-white background, and usually presented in lines of a certain length … All of this is to say that if we really wanted to do evidence-based delivery of text for maximum comprehension, it wouldn’t be like debating one space or two. It would look totally different.”
Read more: https://theatln.tc/h7kJjyKE
📸: Tina Fineberg / AP