How to Choose a Mechanical Keyboard Layout: Full-Size, TKL, 75% and 65% (What to Check)

Choosing a mechanical keyboard starts with size. The layout decides how much of your desk it takes, where your mouse ends up, which keys you keep and which ones move to a function layer. The connection type then decides whether it can follow you between a laptop, a desktop and a tablet. This guide explains what full-size, TKL, 75% and 65% actually mean, the difference between ANSI and ISO, how wired, Bluetooth and 2.4GHz connections compare, and the details to check before you order.

What the size percentages mean

Keyboard sizes are named roughly by how much of a standard full-size board they keep. Exact key counts vary by brand, but the common sizes are:

• Full-size (100%, about 104–108 keys): everything, including the number pad, navigation cluster (Insert, Home, Page Up and so on) and a full function row.
• Compact full-size (96–98%, about 96–100 keys): keeps the number pad but squeezes the navigation keys and arrows into a tighter block.
• Tenkeyless or TKL (80%, about 87 keys): drops the number pad but keeps the function row, the navigation cluster and separate arrow keys.
• 75% (about 81–84 keys): keeps the function row and arrows but packs them tightly, with only a few navigation keys in a column on the right.
• 65% (about 66–68 keys): drops the function row; F1–F12 move to a function layer, while arrow keys and a few navigation keys remain.
• 60% (about 61 keys): drops the arrows as well, so even arrow keys need a function combination.

Match the size to how you work

The right size depends on which keys you use every day:

• Spreadsheets and data entry: a number pad is hard to give up. Choose full-size or a 96–98% board, or pair a smaller board with a separate numpad.
• Writing and general office work: TKL and 75% boards keep the function row and arrows while freeing desk space.
• Gaming: smaller boards leave more room to sweep the mouse. Many players choose 65% or 75%.
• Coding and shortcuts: check where Home, End, Page Up and Delete sit. On 65% boards some of these move to a function layer, which takes practice.

Look at the keyboard's dimensions as well as its name. A 75% board can be nearly as wide as a TKL, and a 98% board can save several inches over a full-size one. Moving from full-size to TKL or smaller also brings the mouse closer to the center of your body, which many people find more comfortable for the shoulder.

ANSI or ISO: check the layout standard

The same size can come in two physical layouts. ANSI is standard in the US: a wide, single-row Enter key, a long left Shift and the backslash above Enter. ISO, common in the UK and much of Europe, has a tall L-shaped Enter key, a short left Shift with an extra key beside it and different symbol positions.

• If you are in the US, choose ANSI unless you specifically need an ISO language layout.
• Some brands ship ISO boards with one default language and extra keycaps for others, so read the listing carefully.
• Replacement keycap sets are made for one standard or the other; an ANSI set will not fully fit an ISO board.

Wired, Bluetooth or 2.4GHz

Many keyboards now offer three connection modes, often called "tri-mode":

• Wired (usually USB-C): lowest latency, no battery to charge, and often the mode used for firmware updates. Some high-performance boards are wired only.
• 2.4GHz wireless with a USB dongle: close to wired performance, with polling rates commonly listed at 1000Hz. Good for gaming without a cable. Check that the dongle has a storage slot so it is not lost.
• Bluetooth: no dongle and easy switching between several devices, including tablets and phones, but higher latency. Fine for typing, less suitable for fast games.

Look for a physical mode switch or a clear key combination for switching, and check how many Bluetooth devices the board remembers. Battery capacity is usually listed in mAh; a bigger battery generally lasts longer, but backlighting has a big effect on real battery life, so look for a stated figure in hours if you can find one.

Check compatibility and customization

• Mac support: look for a Mac mode and Command and Option keycaps in the box. Otherwise the modifier keys may be mislabeled or in the wrong order.
• Remapping software: boards that support QMK or VIA, or have a web-based driver, let you move keys and build function layers, which matters most on small layouts.
• Hot-swap sockets: let you change switches without soldering. Check whether the board accepts 3-pin, 5-pin or both.
• Keycap compatibility: compact boards often use non-standard bottom rows or right-shift sizes. If you plan to buy aftermarket keycaps, check that the set includes the sizes your board needs.
• Typing angle: adjustable feet or kickstands, and whether a wrist rest is available for taller boards.

For an example of a brand that lists layouts, connection modes and battery sizes for each model, see our Varmilo review.

Read the shipping and return terms

Many enthusiast keyboards are sold directly by brands overseas. Before ordering, check where the board ships from, whether import duties are included or collected on delivery, and how long delivery takes. Return policies vary widely: some brands accept only defect returns, and warranty claims can mean paying to ship the board abroad. If you are unsure about size or switch feel, buying from a seller with a clear return window, or trying a switch tester first, reduces the risk.

A quick checklist

• List the keys you use daily: number pad, function row, arrows, Home/End
• Pick the smallest size that keeps those keys, and check the real dimensions
• Choose ANSI in the US unless you need an ISO language layout
• Decide on wired, 2.4GHz, Bluetooth or tri-mode, and check the battery size
• Confirm Mac support, remapping software and hot-swap sockets if you need them
• Check keycap compatibility before planning aftermarket sets
• Read where it ships from, whether duties are included and the return policy