C# is a major, spelled C#, E# and G#. In Ukulele (low G) tuning (G3 C4 E4 A4) the easiest shape is 111x, which sits at fret 1, needs a barre across 3 strings at fret 1 and mutes 1 string. 12 positions for it are shown below, from the nut up to fret 13.
Notes and intervals
Note
C#
E#
G#
Interval
1P
3M
5P
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.
111xsits at fret 1, needs a barre across 3 strings at fret 1 and mutes 1 string6544sits at fret 4 and needs a barre across 2 strings at fret 46898sits at fret 6 and spans 3 fretsx131311sits at fret 11, spans 2 frets and mutes 1 stringx898sits at fret 8, needs a barre across 3 strings at fret 8 and mutes 1 string131313xsits at fret 13, needs a barre across 3 strings at fret 13 and mutes 1 string6598sits at fret 5 and spans 4 frets10131311sits at fret 10 and spans 3 frets1013911sits at fret 9 and spans 4 frets654xsits at fret 4, spans 2 frets and mutes 1 stringx544sits at fret 4, needs a barre across 2 strings at fret 4 and mutes 1 stringx114sits at fret 1, needs a barre across 2 strings at fret 1 and mutes 1 string
Keys C# belongs to
C# is diatonic to 24 of the 96 keys this app knows, playing a different role in each.