What Is a 40% Keyboard?
A 40% keyboard cuts the one block every other size keeps: the number row. What remains is the alpha block, Enter, a couple of Shifts and a handful of mods, roughly 40 to 47 keys depending on the board. The layout rendered below has 44 keys across 12.75u, about 243 mm, with a split spacebar whose halves usually double as layer keys.
40% ANSI: 44 keys, drawn to scale at 1u = 19.05 mm. See it next to other sizes on the keyboard sizes page.
Numbers, symbols, F-keys and navigation all live on layers, typically two or three of them reached from thumb keys. That sounds unusable and, for about a week, it is. Then something interesting happens: because nothing is more than one key away from your home position, practiced 40% typists barely move their hands at all. Boards like the Vortex Core and MiniVan built a small but devoted scene around exactly that feeling.
Exact size and dimensions
The key area of this 40% layout spans 12.75 units wide by 4 units deep. At the standard 19.05 mm key pitch that works out to 242.9 mm wide and 76.2 mm deep before the case bezel is added. There is no standard 40% case or layout: boards like the Vortex Core, MiniVan and ortholinear Planck each use their own geometry, so parts rarely interchange between models.
What keys does a 40% keyboard drop?
- The number row: digits and their symbols move to a layer
- Quote and some punctuation, depending on the specific board
- Everything a 60% already dropped: F-row, arrows, nav cluster, numpad
Layers stop being a workaround here and become the operating system. A typical setup puts numbers on one layer, symbols on another, and arrows plus nav on a third, each held from a thumb key on the split spacebar. Nearly every 40% runs QMK or similar firmware, because tuning the layers to your own hands is not optional at this size, it is the build.
Who a 40% keyboard suits
- Ergonomics enthusiasts chasing minimal finger travel.
- Layer power users who already customize firmware.
- Travel typists: at about 243 mm wide, it disappears into a bag.
- Hobbyists who enjoy the learning project as much as the result.
Try the size before you buy it
The cheapest way to test a form factor is on screen. Open this exact layout in our keyboard builder to restyle it, paint keys and price a real build, or type on it with sound in the switch simulator. Pair the layout decision with a switch decision while you are at it: browse the switch library or jump straight to community favorites like the Gateron Oil King and Boba U4T. And if a flaky key is what pushed you to shop, run your current board through the keyboard tester first.
Pros
- + Fingers rarely leave the home position once layers are learned
- + Genuinely pocketable footprint of about 243 x 76 mm of keys
- + Forces a firmware-level understanding that improves any future board
- + Distinctive builds: the 40% scene is the most creative corner of the hobby
Cons
- - Steepest learning curve of any size, measured in weeks
- - Typing numbers and symbols is slower until layers are automatic
- - No standard layout, so cases, plates and some caps do not interchange
- - A poor fit for shared computers, since nobody else can type on it
Frequently asked questions
How many keys does a 40% keyboard have?
Roughly 40 to 47, with no single standard. The Vortex Core has 47, MiniVan boards run 40 to 45 depending on bottom row, and the ortholinear Planck has 47 or 48. Our render shows a 44-key row-staggered example.
How do you type numbers on a 40% keyboard?
Through a layer: hold a thumb or pinky layer key and the top alpha row becomes 1 through 0. Symbols get a second layer. With practice the chords become as automatic as pressing Shift for capitals.
Is a 40% keyboard practical for daily use?
For committed users, yes, and many type faster than they did on bigger boards thanks to reduced hand movement. But the first two weeks are genuinely slow, and if you share your computer or hate configuring firmware, stop at 60%.