Keyboard size is a trade: every key you drop is desk space you get back for your mouse. Here's how the common layouts compare, from biggest to smallest.
Full-size (100%)
Everything, including the numpad. Great if you enter numbers all day or use numpad binds — but it's the widest board, and it pushes your mouse further from center.
TKL (tenkeyless, ~80%)
Drops the numpad and keeps everything else: the full function row, arrow keys and the navigation cluster. A safe step down for most people.
75%
Keeps a function row and arrow keys but squeezes the navigation keys into a single column. Compact without giving up your F-keys.
65%
Drops the function row but keeps dedicated arrows and a few nav keys. A popular gaming size: a small footprint with nothing you'll miss mid-match.
60%
Letters, numbers and modifiers — arrows, F-keys and navigation live on a function layer. The most mouse room of all, at the cost of more Fn combos outside of games.
How to choose
Look at the keys you actually press. Low-sensitivity players who need room for big swipes tend to go smaller; people who also work on their PC often prefer 75% or TKL. The size guide has a side-by-side chart, and every keyboard lists its exact layout.