Dvorak Was Probably Wrong About A Typist’s Fingers Traveling 20 Miles In A Day

I’ve added a new feature into the Keyboard Layout Analyzer that will let you know the distance your fingers travel while racing across different keyboard layouts. It’s interesting not only because it lets you know how far your fingers are crawling, but because it lets you test out one of Dvorak’s claims on why his layout was better than the QWERTY layout:

Dvorak estimated that the fingers of an average typist in his day traveled between 12 and 20 miles on a qwerty keyboard; the same text on a Dvorak keyboard would require only about one mile of travel.

Sources: [1] [2] [3] [4]

Below I have the results of several pieces of text I analyzed. The QWERTY, Dvorak, and Colemak layouts are compared against each other. The distance shown for each is just an estimate, but it appears as if the idea of typing 20 miles in a day is a little excessive. Also, the Dvorak layout only seems to give you a 40%-45% improvement over the QWERTY layout when it comes to the distance you type.

Caption

Keyboard Monument
(It uses a QWERTY layout)
Photo By jasoneppink (cc)

George Orwell’s 1984 book, Chapter 1:

QWERTY – 0.5629 miles
Dvorak (Simplified) – 0.3107 miles
Colemak – 0.2935 miles

Christopher Nolan’s The Dark Knight Movie Script:

QWERTY – 3.0929 miles
Dvorak (Simplified) – 1.8838 miles
Colemak – 1.8497 miles

Jared Diamond’s The Curse of Qwerty article:

QWERTY – 0.3852 miles
Dvorak (Simplified) – 0.2173 miles
Colemak – 0.1938 miles

Steve Yegge’s Pinocchio Problem blog post:

QWERTY 0.7167 miles
Dvorak (Simplified) 0.4115 miles
Colemak 0.3619 miles

My Previous Post:

QWERTY – 0.0412 miles
Dvorak (Simplified) – 0.0233 miles
Colemak – 0.0211 miles

The algorithm for determining the distances is still being tweaked at the moment, so the distances may change in the future, however, it wont be dramatic. The biggest thing I have left to do is to factor in the pressing of the “shift” keys when an upper case letter is typed.

c is the distance between the F and R keys.

"c" is the distance between the "F" and "R" keys

To the left you can see a diagram showing how the distance between two keys is calculated. The center coordinate of each key is known, so the Pythagorean theorem (c² = a² + b²) is used to calculate the distance between keys. The horizontal distance between the center of two letter keys that are next to each other is said to be 1.9 cm [reference]. This is 40 pixels in my set up. Therefore, I calculate the distance in pixels, and then convert it to meters by dividing by 40 and then multiplying by 0.019. I’m probably currently doing way more calculations than I should be doing, and that will be optimized later, but for now this is how its currently working.

If you’re skeptical about the distances you get back from the program, you can also try Colemack.com‘s Layout Comparison Tool, which also produces estimates on typing distances. They’ll be slightly different from what I display, but they’ll be within the same ballpark. As an aside, somehow I missed seeing that app until recently, but at least our programs have their divergences.

Let me know if you have any issues with the distance calculator. Also, I’ll hopefully have some more updates to the Keyboard Layout Analyzer coming within the next week or two.

10 thoughts on “Dvorak Was Probably Wrong About A Typist’s Fingers Traveling 20 Miles In A Day”

  1. I don’t remember exactly how much modern typewriters were different from keyboards, but it wasn’t that much.

    However, my Dad had a really, really old typewriter that was completely mechanical — not electric at all — and it would put holes in anything but card-stock. I’m not 100% certain how different the spacing was between keys, but there was definitely vertical spacing between the rows.

    Could that have had some kind of impact on Dvorak’s estimates? Even still, 20 miles does seem a bit of a stretch.

  2. I think I may have learned to type on one of those things. When I was little I took a typing class where we had old, non-electric type writers, though I mostly just remember being frustrated with them.

    Anyway, factoring in a vertical plain with large spaces would probably impact things somewhat, though at worst I think it’d probably double the numbers. And it’d also bring up the question of whether Dvorak was talking about the total path distance of one’s fingers, or the distance they would crawl.

    Either way though, his 20:1 ratio in typing distances would still be way out of whack.

  3. That’s a great idea! Though I wonder about one thing – do assume a one finger typist in your measuring of the way? I think that you should at least separate the keyboard into a left half and a right one and measure the distance from the last known position in each half. I think i personally use some kind of a 3 one the left, 2 one the right finger system, other people might use all 10. I guess it would be interesting to add a hand model on top of your system.

  4. No worries, I probably should have explained how I was handling finger placement somewhere. Basically, I assume all the users fingers are on the home row in the correct position. When a key is being pressed, I do the following:

    - If the new key is hit with the previously used finger, move that finger from its old position to the new position (if the same key is being hit twice, a finger does not need to move).
    - If the new key is not hit with the preciously used finger, move the previously used finger back to the home row and then move the new finger to the new key.

  5. Hi there, just wanted to tell you, I loved this post. It was funny. Keep on posting!

  6. Excellent explanations! Sharing with all who would find this article useful! Keep up the great work, sir!

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