Searching for a full size mechanical keyboard shows you a wall of labels: TKL, 75%, 65%, 60%. The percentages sound like a scale. They are not, and they say nothing about which keys you lose or how much desk you win back.
This guide draws the five common layouts at one scale, using case widths that manufacturers publish, and lists the keys each one drops. A switch or a keycap set can be swapped later. A layout cannot, so it is the first thing to settle.
A full size mechanical keyboard has about 104 keys and a number pad, and Keychron lists its 100% K10 Max at 44.7 cm wide. Each smaller size drops a key group: the number pad (TKL, 87 keys), then the gaps and some navigation keys (75%, about 84), then the function row (65%, about 68), then the arrow keys (60%, 61). On Keychron’s published sizes, that takes the width from 44.7 cm down to 30.3 cm.
The short answer
Choose the size by the one key group you refuse to give up:
- Number pad: stay with a full size board, 104 keys on the US layout.
- Function row and arrow keys, but no number pad: a TKL (87 keys) or a 75% mechanical keyboard (about 84 keys).
- Arrow keys, with F-keys on a layer: a 65% board (66 to 68 keys).
- Just the typing block: a 60% mechanical keyboard (61 to 64 keys).
The diagram below shows the whole ladder at once. Every outline uses a manufacturer-published width and depth, so you can see how much room each step down gives back.
This is a source-backed calculation, not a GameVexo test. Widths and depths come from Keychron’s own product pages. The key-grid column is GameVexo arithmetic: the number of key units across, times 19.05 mm.
| Layout | Keys (US ANSI) | Dropped vs 104 | Key grid width | Published case | Reference model |
|---|---|---|---|---|---|
| Full size | 104 | none | 42.9 cm (22.5u) | 44.7 × 14.0 cm | Keychron K10 Max |
| TKL | 87 | 17 | 34.8 cm (18.25u) | 35.5 × 12.3 cm | Keychron K8 Pro, plastic frame |
| 75% | 84 | 20 | 30.5 cm (16u) | 32.8 × 14.5 cm | Keychron Q1 Max |
| 65% | 68 | 36 | 30.5 cm (16u) | 32.7 × 12.1 cm | Keychron Q2 Max |
| 60% | 61 | 43 | 28.6 cm (15u) | 30.3 × 12.1 cm | Keychron Q4 |
1u is one key unit, 19.05 mm center to center. Key grid width is calculated from the standard layout width in units. The case adds a bezel on top of it.
The percentage in each name is a rough size class, not a literal share of keys. A 75% board has about 80 to 84 keys, not 75% of 104, and a 60% board has 61 to 64. Two boards with the same name can also differ by a centimeter or two in width, because of bezel size, case material and extras such as a volume knob.
Full size: what you get
A full size mechanical keyboard, also sold as a 100% board, has every key group: the letters and numbers, the function row (F1 to F12), the navigation cluster (Insert, Home, Page Up and the rest), the arrow keys and a number pad. The US ANSI layout has 104 keys. The European ISO layout has 105, and some boards add four media keys to reach 108.
Keychron lists its K10 Max, a 100% ANSI board, at 447.37 mm by 139.82 mm. That is about 44.7 cm wide and 14.0 cm deep. The key grid itself is narrower. The layout is 22.5 units wide: 15 for the main block, 3 for the navigation cluster, 4 for the number pad and two quarter-unit gaps. At 19.05 mm per unit, that works out to 42.9 cm, so the case and bezel add about 1.9 cm.
What you get is a place for every shortcut, in the layout every office keyboard uses. What you give up is width. The number pad sits to the right of the main block, so your mouse hand has to sit further right than it would on any smaller board.
TKL: the first thing to go
TKL stands for tenkeyless. It is a full size board with the number pad cut off: 87 keys on the US layout, 17 fewer than 104. Everything else stays where it was. The function row, the navigation cluster and the arrow keys are all still there, so no shortcut moves.
Keychron lists the K8 Pro, an ANSI TKL, at 355 × 123 mm with the plastic frame and 359 × 127 mm with the aluminum frame. Against the 447.37 mm K10 Max, the 355 mm board saves 9.2 cm of width, about 21%. In key units, that is roughly five keys of extra room beside the board. These are two different models, so read the gap as an estimate.
The only thing you lose is the number pad. Numbers then come from the number row, which is fine for the odd figure and slow for long runs of data. TKL is the lowest-risk step down: one key group gone, mouse room gained. If price matters as much as layout, our best budget gaming keyboards guide is a place to compare boards at this and the full size.
75%: the current favorite
A 75% mechanical keyboard keeps the function row and the arrow keys but squeezes everything together. The gaps between the main block, the navigation keys and the arrows disappear, and the navigation cluster shrinks to a single column. Retail listings usually put it at 84 keys, though 80 to 83 is common.
Which keys go missing varies by model. Corsair’s size guide names Print Screen, Scroll Lock, Pause, Insert and End as the ones often absent. If you use one of them daily, check the exact layout before you buy, or look for a model with key remapping software.
Keychron lists the Q1 Max, a 75% ANSI board with a knob, at 145 × 327.5 mm. At 32.75 cm, it is about 2.8 cm narrower than the K8 Pro TKL and 12 cm narrower than the K10 Max. The depth tells a different story. At 14.5 cm, the Q1 Max is deeper than that TKL’s 12.3 cm. The Q1 Max is an aluminum-cased board, so published depth reflects case design as well as layout.
Why call it the favorite? It is the smallest layout that still has every row, F-keys included, plus arrows. Corsair’s guide describes it as having become very popular recently, and Keychron’s own catalog lists 75% boards in nearly every line it sells. GameVexo has no sales data, so treat “favorite” as a description of what makers are shipping, not a ranking.
65% and 60%: what you lose
65%: the function row goes
The 65% layout drops the whole function row. F1 to F12 move to a layer you reach with the Fn key. The dedicated arrow keys stay, along with a short column of navigation keys on the right. Most 65% boards have 66 to 68 keys. Keychron lists the Q2 Max, an ANSI 65% with a knob, at 121 × 327 mm.
Compare that with the 75% above: 32.7 cm against 32.75 cm. In Keychron’s Q Max line, going from 75% to 65% does not save width. It saves depth, 12.1 cm against 14.5 cm. If you are choosing between those two for desk space, look at depth, not width.
60%: the arrow keys go too
A 60% mechanical keyboard is the typing block alone: 61 keys on the common ANSI layout, and 61 to 64 across the category. The function row, the navigation keys and the arrows are no longer physical keys. They live on layers. Keychron lists the Q4 at 121 × 303 mm, which is 30.3 cm wide, 14.4 cm (32%) narrower than the K10 Max. It is also 2.4 cm narrower than the 65% Q2 Max. That 2.4 cm is what the arrow column costs.
Desk space, in real centimeters
These numbers come from manufacturer pages, not from a tape measure. GameVexo has not handled any of these boards. Each row shows how much width you get back compared with the 44.7 cm K10 Max.
| Layout | Case width | Width saved vs full size | Share saved | Extra room in key widths |
|---|---|---|---|---|
| Full size | 44.7 cm | 0 | 0% | 0 |
| TKL | 35.5 cm | 9.2 cm | 20.6% | about 4.8 keys |
| 75% | 32.8 cm | 12.0 cm | 26.8% | about 6.3 keys |
| 65% | 32.7 cm | 12.0 cm | 26.9% | about 6.3 keys |
| 60% | 30.3 cm | 14.4 cm | 32.3% | about 7.6 keys |
To use the table, measure the clear width of your desk, subtract the keyboard width, and see what is left for your mouse. A full size board eats the most room. The first big jump comes from the TKL, which gives back about a fifth of the width. After that the gains get smaller: the 60% saves only 2.4 cm more than the 65%.
Treat the figures as a guide, not a promise. Keychron lists the K8 Pro at 355 mm with a plastic frame and 359 mm with an aluminum frame, so the case material alone can move a width by 4 mm. A retailer’s size guide, Evetech, gives similar ranges: 440 to 450 mm for full size, about 355 mm for TKL, about 320 mm for 75% and about 315 mm for 65%. Always read the dimensions on the exact model’s page.
Which size for which use
Numbers, spreadsheets and data entry
Full size. The number pad is the whole point, and no smaller layout has it as a physical block.
Games and general use with room for the mouse
TKL or 75%. Both keep the function row and arrows, and a mouse swipe uses the space to the right of the board, so any size that frees width helps.
Coding and writing with F-keys on a smaller desk
75%. It is the smallest layout that keeps every row, so debugger and shortcut keys stay one press away.
Small desk, but you need arrows
65%. You give up the function row to a layer and keep the arrows. Remember that its saving over a 75% may be mostly depth.
Smallest footprint, carried or shared desks
60%. Only the typing block is physical. Be ready to learn the layers.
Size and sound are separate choices. Once you have a layout, our best quiet mechanical keyboard: 5 picks you can type on at night covers boards for late sessions.
Sources and method
Evidence basis: published manufacturer specifications and public reference pages. GameVexo did not test, handle or measure any keyboard in this guide.
What came from documentation: case widths and depths for the reference boards come from Keychron’s product pages for the K10 Max, K8 Pro, Q1 Max, Q2 Max and Q4.
Reference material: the 19.05 mm key unit comes from a Deskthority community reference. Typical key counts come from a key-count guide. The note on keys often missing from 75% boards comes from Corsair’s size guide. Rough width ranges were cross-checked against Evetech’s layout guide.
GameVexo’s own work: the diagram and the arithmetic. Key-grid widths, widths saved and percentages are calculated from the published numbers above. One model per layout, all from one maker, keeps the method consistent. Other brands will differ.
Frequently Asked Questions
