Fall-off (also known as fall-away) refers to the relief of the fingerboard at the body end of the neck. Typically, this differs from the relief between the nut and the 12th fret.

Here at Plek we have developed a specific unit of measurement to describe fall-off, and normally recommend a fall-off of between 40 and 60.

Plek recommended fall-off typically starts from the 12th fret.

It is however possible to calculate fall-off from any given fret, resulting in what we would call a custom fall-off.