Types of Ukulele

Soprano Ukulele
21 inches. 12 to 14 frets on fingerboard. GCEA.

Concert Ukulele
23 inches. Tuning is GCEA. 14 to 17 frets.

Tenor Ukulele
26 inches. This tuning is also GCEA but some tuned to GCEA that the 4th string is ‘low G’. 17 to 19 frets. 

Baritone Ukulele
30 inches. 19 to 21 frets. The baritone tuning is DGBE. Tunes the same as top four strings of standard guitar DGBE tuning