DESIGN - BRANDING - VISUAL STRATEGY
The science behind all caps.
Have you ever wondered why almost no book is printed entirely in capital letters? Or why designers insist so much on not overusing ALL CAPS on a flyer or a website? The answer isn't an aesthetic whim — it's science. And it's almost a century old.
In 1928, two researchers from the University of Minnesota, Miles Tinker and Donald Paterson, published a study in the Journal of Applied Psychology that remains a cornerstone of typography and editorial design to this day: "Influence of Type Form on Speed of Reading." Their findings changed the way we understand how people read — and they still explain many of the decisions designers make every single day.
The experiment: 640 people, three ways of setting the same text.
Before Tinker and Paterson, the advertising world already had a hunch: text in lowercase seemed to read faster than text in capitals. Daniel Starch had suggested it back in 1914, but with a weak experiment — barely 40 participants, no comprehension checks, and no solid statistical data.
Tinker and Paterson decided to do it properly. They took a standardized speed-of-reading test (the Chapman-Cook), made up of 30 paragraphs of 30 words each, and printed it in three versions that were identical except for one detail: one in regular lowercase, one entirely in CAPITAL LETTERS, and a third one in italics.
Then they recruited 640 university students, divided into eight carefully balanced groups to cancel out practice effects and differences between test forms. Each participant read against the clock, and to prove they had actually read the text, they had to cross out the one word in each paragraph that spoiled the meaning of the sentence. Clever: impossible to cheat without genuinely reading.
The results: all caps slow down reading (a lot).
The numbers were decisive. Lowercase text was read 13.4% faster than text set in all capitals. In concrete terms: participants read 5.38 words per second in lowercase, versus only 4.74 words per second in capitals. Within the time limit of the test, the average reader processed about 565 words of lowercase text but only 498 words of all-caps text.
And this was no borderline result: the difference was statistically overwhelming, and consistent across every group tested.
What about italics? That's a different story. Lowercase text was read only 2.8% faster than italic text. A small difference, though always pointing in the same direction: italics are also slightly harder to read, but nothing compared to the brake that all caps put on reading.
Why does this happen? Three reasons every designer should know.
The authors identified three factors that explain why capitals slow reading down so dramatically:
1. They take up more space. The same text set in all caps occupied 35% more surface area than in lowercase. More space means more eye fixations to cover the same content. Reading is, quite literally, physical work for the eyes — and all caps multiply it.
2. They erase the silhouette of words. When we read, we don't decode letter by letter: we recognize the overall shape of each word. Lowercase letters, with their ascenders (like "d" and "l") and descenders (like "p" and "g"), create unique, recognizable silhouettes. Capitals, on the other hand, turn every word into a uniform rectangle. TRY READING AN ENTIRE PARAGRAPH LIKE THIS and you'll feel it.
3. They're less familiar. Some 99% of what we read in daily life is set in lowercase. Continuous capitals create an unusual reading situation, and unfamiliarity comes at a cost in speed.
In the case of italics, the difference is minimal precisely because they occupy the same space and preserve a word silhouette very similar to that of regular lowercase.
What this means for your brand, almost 100 years later.
This study was designed with the advertising and newspaper headlines of the 1920s in mind. But its conclusions are more relevant than ever in a world where we compete for seconds of attention.
A few practical takeaways we always keep in mind at Syrah Design:
- Capitals are for accents, not paragraphs. A short headline in caps can add hierarchy and impact. A full block of text in caps is an invitation not to be read.
- Legibility is strategy, not decoration. If your brochure, your website, or your post reads 13% slower, part of your audience simply gives up before reaching the message.
- Italics, in moderation. They work well to emphasize a word or a quote, but not for long passages.
- Design means deciding with evidence. The best typographic decisions don't come from personal taste — they come from understanding how the reader's eye and brain actually work.
Next time you see a design where the text flows effortlessly, remember that behind that feeling of ease there are decades of research… and a designer who knows them.
Is your brand communicating in the most readable way possible? At Syrah Design, we love answering that question with design and with data. Contact us!
