C#m7b5 is a half-diminished, spelled C#, E, G and B. In Standard tuning (E2 A2 D3 G3 B3 E4) the easiest shape is x45000, which sits at fret 4, spans 1 fret, lets 3 strings ring open and mutes 1 string. 12 positions for it are shown below, from the nut up to fret 14.
Notes and intervals
Note
C#
E
G
B
Interval
1P
3m
5d
7m
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.
x45000sits at fret 4, spans 1 fret, lets 3 strings ring open and mutes 1 stringx42000sits at fret 2, spans 2 frets, lets 3 strings ring open and mutes 1 string979000sits at fret 7, spans 2 frets and lets 3 strings ring open9109000sits at fret 9, needs a barre across 3 strings at fret 9 and lets 3 strings ring open045003sits at fret 3, spans 2 frets and lets 3 strings ring open9109080sits at fret 8, spans 2 frets and lets 2 strings ring openxxx600sits at fret 6, needs no stretch at all, lets 2 strings ring open and mutes 3 stringsxx11000sits at fret 11, needs no stretch at all, lets 3 strings ring open and mutes 2 strings075600sits at fret 5, spans 2 frets and lets 3 strings ring open01011000sits at fret 10, spans 1 fret and lets 4 strings ring open014140140sits at fret 14, needs no stretch at all and lets 3 strings ring open0141401412sits at fret 12, spans 2 frets and lets 2 strings ring open
Keys C#m7b5 belongs to
C#m7b5 is diatonic to 8 of the 96 keys this app knows, playing a different role in each.