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40% is a term to describe very small, usually community-made keyboards. The most notable characteristic of such keyboards is that they lack the number row, requiring the use of an Fn key or equivalent to enter digits. 40% keyboard designs exhibit more variation and creativity than 60% designs, as the latter tend to be based heavily on the basic ANSI and ISO full-size keyboard. 40% keyboards frequently have split ergonomic or ortholinear layouts.
- Deskthority — Tiny Hacking Keyboard (THKB)
- Geekhack — SmallFry KB
- Deskthority — HyperMicro (not referred to here as "40%")