F#dim is a diminished, spelled F#, A and C. In Standard tuning (E2 A2 D3 G3 B3 E4) the easiest shape is 2342xx, which sits at fret 2, needs a barre across 4 strings at fret 2 and mutes 2 strings. 12 positions for it are shown below, from the nut up to fret 13.
Notes and intervals
Note
F#
A
C
Interval
1P
3m
5d
12 ways to play it
Ordered by how hard they are to fret, easiest first, one per position on the neck. Fret numbers are relative to the position marked beside each grid.
2342xxsits at fret 2, needs a barre across 4 strings at fret 2 and mutes 2 strings20421xsits at fret 1, spans 3 frets, lets 1 string ring open and mutes 1 string5045xxsits at fret 4, spans 1 fret, lets 1 string ring open and mutes 2 strings5345xxsits at fret 3, spans 2 frets and mutes 2 stringsx07575sits at fret 5, needs a barre across 3 strings at fret 5, lets 1 string ring open and mutes 1 stringx9101110xsits at fret 9, spans 2 frets and mutes 2 stringsx0101110xsits at fret 10, needs a barre across 3 strings at fret 10, lets 1 string ring open and mutes 2 strings897xxxsits at fret 7, spans 2 frets and mutes 3 stringsxxx11108sits at fret 8, spans 3 frets and mutes 3 stringsxxx141314sits at fret 13, spans 1 fret and mutes 3 stringsxxx212sits at fret 1, spans 1 fret and mutes 3 stringsxx4212sits at fret 1, spans 3 frets and mutes 2 strings
Keys F#dim belongs to
F#dim is diatonic to 8 of the 96 keys this app knows, playing a different role in each.