Unit
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A unit is a measurement of keyboard key width, based on the size of a normal letter key (which is 1 unit tall by 1 unit wide). One unit is the distance from one key to the next; keycaps are fractionally less than their unit size to allow for gaps between keys.
Key sizes are usually in multiples of ½ (0.5) or ¼ (0.25) unit. For instance, a typical Space bar for a modern PC keyboard is 6.25 units wide, taking up the same space as six and one quarter one-unit keys.
On a full-size keyboard, 1 unit is normally 0.75 inches, or approximately 19 mm.
Note that one unit of height may be different from one unit of width on a keyboard.
Cherry
1 unit is defined as 19.05 mm, or 0.75ʺ
Gallery
2 × 1 unit, 1 × 1.25 unit
2 × 1 unit, 1 × 1.5 unit
2 × 1 unit, 1 × 1.75 unit
2 × 1 unit, 1 × 2 unit
