How high are guitar strings off of the fretboard?

The height of guitar strings above the fretboard, also known as the action, varies depending on personal preference, guitar type, and playing style. On average, the strings are set at a height of around 2 to 3 millimeters (mm) above the frets on the higher strings (treble side) and 2.5 to 3.5 mm above the frets on the lower strings (bass side).

However, some players may prefer a higher or lower action to suit their playing style or the genre of music they are playing. For example, players of slide guitar often prefer a higher action to avoid unwanted fret buzz, while players of shred guitar may prefer a lower action to facilitate fast and precise playing.

The guitar's action can be adjusted by raising or lowering the bridge saddles or the nut slots, which are the small grooves where the strings sit at either end of the fretboard. Adjusting the action requires careful measurement and adjustment, and it's generally recommended to have a professional guitar technician perform this task to ensure proper intonation and playability.